What can we do for them _____ for all the help they have given us?
| A．in turn |
| B．in return |
| C．by turns |
| D．out of turn |
Beijing was attacked by such a terrible sandstorm ______few citizens had ever experienced before.
| A．and it was | B．as | C．that | D．which |
He______ on this paper for ten minutes but he______only about sixty words.
| A．will have worked, has written | B．worked, has written |
| C．has been working, has written | D．will be working, works |
Mr Wang______an article on how to improve spoken English last month, but I don’t know whether he has finished it.
| A．has written | B．wrote | C．had written | D．was writing |
You can’t guess ______ when he was admitted by Beijing University.
| A．how he was happy | B．how happy was he |
| C．how happy he was | D．he was how happy |
As teachers, we feel______our duty to teach our children to be good wherever we are.
| A．this | B．that | C．it | D．there is |