VI.1. is cheaper and better for the environment so it is becoming more and more important

2. all waste things not only will we save money and energy but also the environment will be cleaner 3.is considered to be an efficient way to dispose of waste

4. to water the roots and soil aroumnd plants rather than spraying the leaves and flowers

5. provided the flood victims with food, clothes and money.

VII.1. better lock should be locked on the door should put a better lock on the door

2.down the volume at night be reduced at night

3. examination should be taken carefully should take the entrance examination carefully

4. care of her puppy is her responsibility caring for her puppy is her responsibility

5. should be checked by a plumber should check the pipes

6. hoa was very tired, she left___

7.inviting Hoa and Tuan to join our club

8. tuan had a headache,he still stayed___

9.our studying in the same class, we often___