With temperature ______ so rapidly, we could not go with the experiment．
| A．fall | B．falling | C．fallen | D．to fall |
As she is looking forward to ______ from me, please remember ______ this letter on your way to school.
| A．hear; post | B．hearing; to post | C．be heard; posting | D．be hearing; to posting |
—May I smoke here?—If you ______, choose a seat in the smoking section.
| A．should | B．could | C．may | D．must |
Australia is such a splendid country that we’ve decided to stay for ______ two weeks.
| A．another | B．other | C．the other | D．other’s |
When he got to ______ top of the mountain, he was almost out of ______ breath
| A．the; a | B．the; the | C．the; / | D．a; / |
As soon as he comes back, I’ll tell him when ________ and see him.
| A．you will come | B．will you come | C．you come | D．do you come |