Give the correct form of the verbs to complete the sentences

I. Give the correct form of the verbs to complete the sentences
6. My classmate and i often .............. our neighborhood at the weekend. (clean)
7. How about ............................... the plastic bottle to grow flowers. (reuse)
8. If she ................... the lights , she ................ the electricity. (turn off - save)
9. ................ you ................ part in the environment project last week? (take)