1. I have never painted a mural over graffiti before.
2. Mr.Binh has recycled rubbish for 2 year.
3. Because David was lazy, he failed the exam.
4. It's five months since they last cleaned up the street.
5. We began to donate books and clothes ten years ago.
6. We should eat a lot of fruit and vegetable every day.
7. Because it rained heavily,we couldn't keep on cleaning the streets.
8. Unless the weather improved,the garden party won't take place.
9. The library lend both students and teachers books.
10. He plays this pieces of music most beautifully.