VII. Fill in each gap with a suitable preposition. to 1. We are deeply disappointed .... the result 2. We should wear coats to protect ourselves ... the sun. 3. Trees provide us ... fresh air. 4. Don't do harm ... the environmen 5. Toxic chemicals continue to be dumped ... the North Sea. 6. You should prevent lazy students ...littering 7. My sister kept......asking silly questions 8. The garbage bin is full ..... junk again 9. We are all responsible . . . keeping the environment clean. 10. Don't throw trash .... water because it can do harm .... the environment. VII. Rewrite the sentences without the meaning changes. 1. Recycle and we will save natural resources. =>If 2. Working too much will make you tired. =>If 3. Lan is a very hard worker. =>Lan works 4. Her mother cooks very well. =>Her mother is 5. We stayed at home because it rained heavily. =>Since