The question that puzzled us is _____ we can get rid of the air pollution in the area.
| A．that how | B．how is it that | C．what is it | D．how it is that |
E-mail, as well as phone calls, _____________ an important part in daily communication.
| A．are playing | B．is playing | C．have played | D．has played |
If we don’t take steps, some rare animals, such as the Tibetan antelopes and pandas will ____________ some day just as dinosaur.
| A．die out | B．die away | C．die down | D．die off |
------- How can we __________ to a changeable environment?
-------- By constant study and changing our ideas.
| A．adopt | B．adapt | C．add | D．admit |
----- How did you find _________ long talk given by the headmaster on ___________ Teachers’ Day?
-------- Boring. I’d rather he had made it short.
| A．a ; the | B．the ; / | C．a ; / | D．the ; the |
21 ------ He runs his own company at the age of 21.
------- ___________________
| A．Good luck! | B．That’s quite something |
| C．Congratulations! | D．It’s hard to say. |