Supply the correct form of words in the brackets

I/ Supply the correct form of words in the brackets.
1. Be quiet ! The baby (sleep) …………………
2. If he (try) ………………… hard, he’ll pass the examination.
3. If he (try) ………………… hard, he’ll pass the examination.
4. Homework must (do) regularly.
5. I ………………… (post) a letter to her 2 months ago, but she ………………… (not answer) me yet.
6. What ……………… (you do) from 2 pm to 6 pm yesterday? – I ………… (be) in the library.
7. Ba usually………………. (go) to school by bike.
8. Lan………………… (read) book in her room at the moment. She always enjoy ………………… (do) that.
9. If you ………………… (study) hard, you ………………… (get) good mark.
10. When the phone ………………… (ring) last Friday night, she ………………… (cook) dinner.
11. The telephone (invent) ………………………………by Alexander Bell.
12 Is Lan used to ( write) ……………………………… to Maryam?
13. He used to (take) ………………………………to school by his mother.
14. They (live) ………………… in that house since it (build). …………………………