EXERCISE 1: Complete the sentences. Use the information in the box and the modal verb in parentheses.
quit it at once
be very happy
leave the building in order
go out for a walk
find another one
be very worried
come to visit me more
understand the lectures well
buy a smaller one
1. If you have toothache, you mustseethedentisL ............................ (must)
2. If it rains, we ................... (should not)
3. If the class is full, I......................... (will)
4. If it costs too much, we.................. (must) 
5. If you don’t come home early, your parents........................... (may)
6. If that job is boring, Susan ....................... (may)
7. If you listen carefully, you.............................. (can)
8. If a fire breaks out, everyone................................. (have to)
9. If you have more time, you....................................... (ought to)
10. If you phone your parents more often, they..................................... (must)
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1. If you have toothache, you must see the dentist ......................(must)
2. If it rains, we ...........................(should not go out for a walk)
3. If the class is full, I................................ (will find another one)
4. If it costs too much, we....................................... (must buy a smaller one)
5. If you don’t come home early, your parents............................... (may be very worried)
6. If that job is boring, Susan................................ (may quit it at once)
7. If you listen carefully, you.................................. (can understand the lectures well)
8. If a fire breaks out, everyone.................................... (have to leave the building in order)
9. If you have more time, you.............................. (ought to come to visit me more)
10. If you phone your parents more often, they ..................................(must be very happy)
Complete the second senten so that it means the same as the first. Use the corect modal verb and any other necessary words.
1. It is very important that you check in your luggage an hour before your flight.
You .should check in... your luggage an hour before your flight.
2. Smoking is not allowed in the doctor's waiting room.
All employees ..mustn't allow.. to use a computer.
Refer
1. It is very ______relaxing____ to lie on the beach, and listen to the sound of the waves.
2. That’s ____weird_____ - I thought I’d left my keys on the table but they’re not there.
3. Many teens are ____hooked______ on social networks like Facebook, Twitter and Instagram.
4. The website allows you to take a _____virtual_____ tour of the art gallery.
5. He was not ____satisfied______ with the camera, so he took it back to the store.
6. Bird-watching is an increasingly popular _____leisure_____ activity.
7. Hanging out with friends is ____fun______. I really enjoy it.
8. Are you _____addicted_____ to Facebook, Twitter, Tumblr, or Instagram?
III. Complete the sentences with the correct adjective form (-ED/-ING) of the verb in brackets.
1. I am ________interested______ (interest) in working for a charity when I finish college.
2. I found the first part of the concert quite long and _______boring_______ (bore).
3. I am a big fan of Madonna. I was very ______excited______ (excite) when I heard she would be at the concert.
4. I thought the negative attitude of the media was________disappointing_______ (disappoint).
5. It was a very long day. I was very ______tired_______ (tire) at the end.
6. I enjoyed reading a very _______interesting_______ (interest) article about the event in the newspaper.
1 If it rains, the match might be canceled. (might / cancel)
(Nếu trời mưa, trận đấu có thể bị hủy.)
2 During lessons, your mobile phone must be left in your bag. (must / leave)
(Trong giờ học, điện thoại di động phải được để trong cặp.)
3 Meat should be cooked right through. (should / cook)
(Thịt phải được nấu chín kỹ.)
4 Books must not be taken out of the library. (must not / take)
(Sách không được mang ra khỏi thư viện.)
5 School uniforms needn't be worn on the school trip. (needn't / wear)
(Không cần mặc đồng phục trong chuyến dã ngoại của trường.)