Write the sentences, using the correct form and tense of the verbs in brackets: 
1. If the police ask Mike, he ____________ (expose) the waste dump to them.
2. Since used bottles _______ (recycle), the amount of garbage is reduced.
3. If I were you, I ________ (reuse) all the old panels.
4. The river would be cleaner if we _________ (stop) throwing garbage into it.
5. Deforestation makes lots of specis in the forest _________ ( die).