Complete the sentences with the correct form of the verb.
1. We (do) _______________________ this for you if you want.
2. The weather (be) _____________________ quite good since Christmas.
3. If we (need) _______________________ some help, we will ask.
4. They enjoy ________ (watch) the Olympics on TV.
5. Children shouldn’t ________ (buy) firework at Tet.
6. You ________ (meet) Hien and Phuong three days ago?
7 I love ________(do) judo.
8. Nam ________(go) to the post office twice yesterday.
9. I ________ (leave) my school bag at school this morning.
10. Mr. Quang ________ (teach) math in this school since he ________ (graduate) from the university in 1989.
11. Look! The singer ________(come). She ________ (have) long black hair.
12. Where (be)________ Son? He (read)________ books in the library.
13. I (have) _____________________ this bike since I was a teenager and I still use it.
14. I (study) _____________________very hard for this examination.