Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 44.

Bird migration is one of the most interesting yet least understood natural phenomena. Every fall birds from northern latitudes fly in groups to the warmer southern latitudes and then return north in the spring. Scientists agree on the main reasons for migration: to follow the food supply and to avoid harsh climate conditions. For example, insects disappear during the cold months, prompting insect-dependent birds to fly south to warm areas where insects breed. No similar consensus has emerged, however, about how birds are able to navigate. Despite many recent experiments, bird experts still do not know how birds arrive at the same destinations every year and then find their way back home in the spring.

Some have suggested that birds find their way by following landmarks, such as rivers and mountain ranges. Experiments have confirmed that some species do follow such topographic features. But that method cannot explain how some birds travel at night. Other studies show that some nocturnal birds navigate by the stars. But that explanation cannot explain daytime migration or travel when the skies are cloudy.

The most popular explanation currently is that birds are guided by Earth's magnetic poles. The mechanism by which that works has not yet been proved. One theory points to the fact that some birds' contain magnetite, a naturally occurring magnetic compound consisting of iron oxide. Magnetite has been found in many animals, including birds. With magnets embedded in their brains, birds would be able to sense the magnetic fields of the North and South Poles.

A recent experiment with homing pigeons provided some evidence that magnetite does play a crucial role in migration. Homing pigeons are known to have the ability to return to their homes after being taken hundreds of miles away. Researchers found that they could train homing pigeons to recognize changes in a magnetic field. When a surrounding magnetic field was normal, the birds would gather at one end of a cage. But when the field's polarity was altered, they hopped to the other end, suggesting that they were directing and responding to changes in the magnetic field.

Another theory has been offered to explain this sensitivity to magnetic poles, a theory that draws upon quantum mechanics, which is the study of how particles move inside an atom. It relies on the fact that electrons come in pairs that orbits the nucleus of an atom. The two electrons spin in opposite directions, creating two magnets that neutralize each other. But when molecules split and react with other molecules to form compounds, the electrons pairs may no longer spin in opposite directions. Instead, they may repel each other, as when two north ends of magnets are pressed together. The electrons struggle to change direction in order to achieve a stable state in which the two electrons again neutralize each other, giving off no magnetic field.

Question 35: The word "phenomena" in the passage is closest in meaning to

A. events          B. trends         C. discoveries         D. theories

Question 36: According to paragraph 1, insects influence bird migration in which of the following ways?

A. insects generate a magnetic field that birds can detect

B. Insects provide a food supply that exists only in warm climates

C. Birds follow the paths taken by flying insects

D. birds know when to migrate by a sudden increase in insect population

Question 37: The word "some" in the passage refers to

A. insects         B. recent experiments  C. bird experts       D. birds

Question 38: According to paragraph 3, birds can detect the magnetic fields of the North and South poles because

A. they sense the motion of electron pairs

B. they can locate the poles by following landmarks

C. they ingest metal particles that are attracted by the poles

D. they have magnetite in their brains

Question 39: The word "embedded" in the passage is closest in meaning to

A. implanted        B. attached         C. attracted        D. activated

Question 40: The author discusses "homing pigeons" in paragraph 4 in order to

A. provide an example of how humans can train birds

B. describe an experiment showing the importance of magnetite

C. show that homing pigeons return home by following landmarks

D. report homing pigeons' behavior inside a cage

Question 41: According to the passage, all of the following are theories about how birds navigate EXCEPT:

A. They follow landmarks like rivers and mountains

B. They are guided by their position relative to the stars

C. They feel vibrations in nerve endings in their brains

D. They respond to changes in light

Question 42: According to paragraph 4, the pigeons moved to the opposite end of a cage because

A. The magnetic field was normal

B. The magnetic field was stronger at one end

C. The magnetic field changed its polarity

D. The magnetic field was removed

Question 43: The word "altered" in the passage is closest in meaning to

A. reversed        B. cancelled        C. strengthened         D. detected

Question 44: Which of the following can be inferred about an electron pair in two north ends of magnets?

A. The two electrons spin in opposite directions

B. One electron will move to the south end

C. One electron will be captured by the nucleus

D. The two electrons spin in the same direction

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Question 16: Vietnam's renowned rocker Tran Lap, ................. died of cancer on 17 March 2016, will be honored with a posthumous medal for his contribution to the country's music industry

A.that           B. who             C. whom            D. whose

Question 17: If you................. away, I'll send for the police at once.

A. don't go       B. not go           C. didn't go          D. hadn't

Question 18: ............ her doctor warned her, Carol has continued to smoke nearly three packs of cigarettes a day.

A.despite        B. despite of        C. in spite            D. even though

Question 19: She passed me on the street without speaking. She .................me

A.Mustn't see                   B. can't see

C. mustn't have seen              D. can't have seen

Question 20: The city Parks Department is putting in several miles of new trails because so many people have said that they enjoy...............on them.

A. walking        B. being walked     C. to walk            D. to be walked

Question 21: My new glasses cost me ......................the last pair that I bought last month.

A. more than three times           B. more three times than

C. three times as much as          D. as much three times as

Question 22: This young tree could not have been damaged by accident. I believe it was done .............

A. in fact        B. on purpose       C. by appointment     D. by plan

Question 23: The stage designed was out of this ..............but unfortunately the acting was not so impressive.

A. moon         B. planet           C. world             D. earth

Question 24: . "Good, thanks. Listen, I am having a birthday party next Friday. Do you want to come?" "............."

A. Sure, I'd love to!               B. Yes, why not.

C. Yes, thank you. What time?       D. That's alright!

Question 25: While Charlie Puth ..........the rose bush in the back yard, the phone rang.

A. had been watering              B. watering

C. watered                      D. was watering

Question 26: ......................to the Senate than he began to face some of the realities of being a U.S. senator: the heavy work load; maintaining two households, being away from his family.

A. No sooner had Obama been elected       B. No sooner Obama had been elected

C. No sooner had Obama elected           D. No sooner Obama had elected

Question 27: Jane has bought .......... sleeping bag

A. an ugly small old black plastic       B. an ugly old small plastic

C. a small ugly black old plastic        D. a black ugly plastic

Question 28: We are in an unbalanced situation when women ..................over 75% of our staff.

A.contract          B. cover            C. consist           D. comprise

Question 29: In "Descendants of the Sun" , soldier Yoo Shi Jin (Song Joong-Ki) falls in love with surgeon Kang Mo Yeon (Song Hye-Kyo) in Uruk, which is an .................country at war.

A.Imaginative       B. imagining        C. imaginary        D. imaginable

Question 30: "Thank you for taking the time to come here in person." ".........................."

A. I'd love to come. What time?           B. It's my pleasure

C. Do you have time for some gossip?     D. I don't know what time that person comes

Question 31: Beware of the people who appear to be enthusiastic ......... your success

A.of               B. with             C. about            D. on

Question 32: Many elderly people have to live on the money they ......... when they were working

A. laid up          B. put back         C. set up           D. put aside

Question 33: It was with a ................. heart that she said goodbye to all her classmates.

A. solemn          B. heavy           C. dismal           D. grim

Question 34: There are other hobbies that I indulge......... for a while.

A. in              B. on              C. at               D. of