Only when our country has aircraft carriers _______ our distant islands more effectively.
| A．we can guard | B．can we guard | C．we guard | D．do we guard |
---Have you heard the latest news?
---No, What?
| A． | is it | B． | is there | C． | are they | D． | are those |
_____ in the queue for half an hour,Tom suddenly realized that he had left his wallet at home．
| A．To wait | B．Have waited |
| C．Having waited | D．To have waited |
The library needs _____,but it’ll have to wait until Friday．
| A．cleaning | B．to clean |
| C．being cleaned | D．to being cleaned |
--- Catherine, I have cleaned the room for you．
---Thanks．You _______ it．I could manage it myself．
| A．needn’t do | B．shouldn’t have done |
| C．mustn’t do | D．needn’t have done |
It didn’t take the children long to________ the correct answer．
| A．carry out | B．figure out |
| C．turn out | D．give out |