Rewrite the sentences

Rewrite the sentences
1. David had gone home before we arrived.
-> After ........
2. we had lunch then we took a look around the shops.
-> Before.....
3. Eating to much sugar can result in health problems. (lead to)
-> .......
4. My father had watered all the plant in the garden by the time my mother came home.
-> Before......
5.  Acid rain is dangerous. Trees' leaves are damage. (because of)
-> ............
6. After she had explained everything dearly, we started our work.
-> ......
7. Mr.Quang works in a noisy environment. His hearing becomes worse.(if)
->.........
8. The light had gone out before we got out of the office.
->....................