---Sorry, sir. Ms Wang ___ (explain) a maths problem to me.
2. I am sorry you ______________(miss) the train. It left 10 minutes ago.
3. The 2014 Youth Olympic Games (hold) in Nanjing from August 16th to 28th.
4. He always tries what he can _____________ (help) others in need. He is great.
5. My bike needs ___________(repair). I need _____________(repair) it this morning.
6. What do you think ______________(talk) about at the meeting tomorrow?
7. There is a wallet ______________ (lie) on the ground. Please pick it up.
8. We needn’t worry about _____________ (not meet) again.
9. My mother has had the clothes _____________(wash).
10. When I got to the station, no one________________ (wait) for me.
11. I didn’t understand the problem until it ____________(expalin) a third time.
12. The sports meeting ______________(hold) in our school in September every year.
13. ---What is he busy doing?
---Doing the experiment ________________(complete) the science project.
14. Though Mr. Wu ___________________(explain) the maths problem to us three times, about
thirty percent of us cannot understand it.
15. ---Turn off the radio, dear. Baby is sleeping. ---There is no need. He __________(wake) up.
16. You mustn’t touch the machine until you ___________(teach) how to use it.
17. _____________(Wake) up early doesn’t mean getting up early.
18. Don’t worry. You ________________(give) some money next week.
19. What problems do you have ____________(live) near the airport?
20. ---Don’t park here, please! --- Sorry, I _____________ (not see) the sign.