. Fill in each blank with the correct word: more, fewer or less.

1. Susan has ____________ homework than Mary, so Mary has to work harder than Susan.

2. The new law limits smoking in public. There are _________ places where people can smoke.

3. This factory has ____________ workers than that one, so it needs more.

4. There are ____________ cars in the street at this time. The traffic is so heavy.

5. Class 7A has 40 students, and Class 7C has only 36 students. Class 7A has ____________ students than Class 7B.

6. ____________ fruits are now in season in the south. There are plenty of fruits now.

7. Farmers have ____________ time off than workers. Farmers work harder than workers.

8. The weather in winter is worse than that in summer. People get ____________ colds in summer than in winter.

9. I think we don’t have many public holidays. We ought to have ____________.

10. We are lucky. We work ____________ hours than any workers

1. Alternative sources of energy are ___________ and safe.

A. enough B. not enough C. short D. abundant

2. Nuclear energy can provide enough electricity for the world’s needs, but it is very _____.

A. risk B. risky C. endanger D. endangered

3. We should try to reduce energy ___________ as much as possible.

A. production B. producers C. consumption D. consumers

4. We are looking for cheap, clean, ___________ sources of energy.

A. polluting B. harmful C. expensive D. effective

5. Solar energy is ___________ and it can be replaced easily.

A. new B. renew C. renewable D. non-renewable

6. For many people living in rural areas, biogas is a cheap energy _______available.

A. method B. production C. supply D. consumption

7. People living in the slums never get good healthcare, ___________?

A. do they B. don’t they C. are they D. aren’t they

8. Everyone is ready for the game, ___________?

A. is it B. isn’t he? C. aren’t they D. is there

9. People move to big cities for a better ___________.

A. standard of living B. standard life C. standard living D. life of standard

10. Slidewalks are ___________ to moving walkways in airport.

A. familiar B. similar C. different D. same

11. Rio de Janeiro is very cultural ___________ city.

A. diverse B. diversity C. different D. same

12. Which is the best ___________ of transport for the future?

A. mean B. means C. traffic D. ways

13. Overcrowded places have a lot of problems, ___________?

A. don’t they B. does it C. doesn’t it D. have they

14. The schoolyard is very small, so there isn’t enough ________for students to play in.

A. rooms B. land C. space D. ground

15. I think in the future cities will be more crowded and the traffic will get___________.

A. good B. well C. worse D. worst

16. When ___________ people live in a small place, life can be very difficult.

A. a few B. few C. too much D. too many

17. Do you think it will be a (n) ___________ , green way to travel?

A. convenient B. polluted C. polluting D. inconvenience

18. Children in the slums have more diseases than _________ in wealthy areas.

A. them B. that C. those D. ø

19. Diseases ___________ more quickly in overcrowded areas.

A. move B. travel C. spread D. come

20. In Manila, over 30% of the population lives in ___________.

A. crops B. poverty C. shortage D. schooling

1. A. enjoyable B. comfortable C. convenient D. difficult

2. A. waste B. recycle C. conserve D. save

3. A. affect B. replace C. effect D. fly

4. A. density B. overcrowded C. crime D. megacity

5. A. drive B. cycle C. ride D. fly

6. A. wind B. gasoline C. coal D. natural gas

7. A. float B. slum C. hunger D. explosion

8. A. safely B. poverty C. slumdog D. space

9. A. abundant B. short C. plentiful D. unlimited

10. A. driver B. doctor C. criminal D. student

Hòa tan hoàn toàn 32,5g muối Sắt(III)clorua trong 100 ml dd NaOH. Kết tủa thu được đem phản ứng hết với 200g dung dịch ax Sunfuric H2SO4.

a. Viết PTHH

b. Tính nồng độ phần trăm của dung dịch H2SO4 đã dùng?.

Cho 100ml dung dịch Na2CO3 1M tác dụng vừa đủ với 200 gam dung dịch Ba(OH)2.

a. Viết PTHH xảy ra.

b. Tính khối lượng chất kết tủa thu được.

c. Tính nồng độ % của dung dịch Ba(OH)2 dùng cho phản ứng trê