-Are you going to climb the mountain tomorrow?
--Yes. But if it ______, I_______ at home.
| A．rains； stay. | B．will rain； stay. |
| C．will rain； will stay | D．rains； will stay |
I began watching here an hour ago, but now nothing _______ yet.
| A．happens | B．will happen |
| C．happened | D．has happened |
---- A number of voiunteers _____ willing to teach in China’s rural areas.
----- Yes. The number _____ getting bigger and bigger.
| A．is ; is | B．are; is |
| C．is; are | D．are; are |
It’s sometimes hard to tell one twin from _____.
| A．anther | B．some other |
| C．other | D．the other |
--Where is your father?
---- He _____ Australia and he _____ Sydney for two weeks.
| A．has been to; has been in | B．has gone to; has been in |
| C．has been in; has been to | D．has gone to; has been to |
----Have you ever been to Shanghai? ----Yes. I _____ there with my father last year.
| A．went | B．have been |
| C．have gone | D．has been |