1. The environment in the city is much polluted than that in the countryside. 

-> more

2. In the countryside, houses are often little furnished and bigger than those in the city. 

-> less 

3. The communication system in the countryside become more modern in the last ten years because electricity is available in more places.

-> place

4. I prefer live in the countryside than in the city, people are normally healthier and fitter.

-> living

5.50 years ago, farmers depended more heavy on the weather than at present.

-> heavily

6. I'm not sure about what we should to do

-> do

7. Are we going to must work overtime again this week?

-> have to

8. We have many things to do this week, so I don't know if I can't go to English class.

-> couldn't

9. I have to thought about the problem for a while, but I finally figured it out.

-> think

10. You should quiet in class; otherwise, your classmates can't concentrate.

-> be quiet

TRONG CÂU SAU KHOANH CHỖ SAI VÀ SỬ LẠI
 

1. The environment in the city is much polluted than that in the countryside.
                                 A                        B       =>much->more                   C

2. In the countryside, houses are often little furnished and bigger than those in the city.
                                       A                             B   =>little=>more                   C

3. The communication system in the countryside become more modern in the last ten
                                                                                 A                   B         the most modern                                                              
years because electricity     is available in more places.
                                                                         C

4. I prefer live in the countryside than in the city, people are normally healthier and fitter.
                 A     =>to live                                                                                       B                   C

5. 50 years ago, farmers depended more heavy on the weather than at present.
             A                                                       B                                        C=>now