Ex: Find and correct the mistakes.

1. You should turn on devices while you are not using them.  ->..........................

2. Don't throw rubbish on rivers and lakes.  ->............................

3. Polluted water is unsafe for drink.   ->............................

4. Cut down trees destroys a lot of wildlife habitats.   ->............................

5. Saolas are endangerous animals.   ->................................

6. Don't come back until you will find a new job.   ->...................................

7. When we finished our picnic, we clean up the site.  ->....................................

8. People can cycle instead of walk to work.   ->........................................

9. The park is also house to a lot of valuable kinds of woods.  ->...............................

10.The ecosystem in Con Dao is very diversity.  ->............................