----Where did you put the broom,Tom?
-----I _______it behind the door．But now it is gone．
| A．do put | B．do putting | C．did to put | D．did put |
They kept trying __________ they must have known it was hopeless.
| A．if | B．because | C．when | D．where |
The bad weather meant __________ the rocket launch(发射）for 48 hours.
| A．delaying | B．having delayed |
| C．to delay | D．to have delayed |
Although the country has had political independence for over a century，__________ it needs the support of its neighbors.
naturally B. economically C. especially D. Luckily
— Is there any possibility __________ you could pick me up at the airport?
—No problem.
| A．when | B．that |
| C．whether | D．what |
I suggested that we break off for tea in a( n)__________ to reduce nervousness.
| A．attempt | B．thought |
| C．preparation | D．expectation |