The important task will take Peter and me about four months to complete, so it will be a long time _____ we meet you again.
| A．after | B．when | C．since | D．before |
The question _______ we can get enough coal for the winter has not been cleared up yet .
| A．that | B．if | C．which | D．whether |
Every possible means ________ to prevent the air pollution , but the sky is still not clear.
| A．is used | B．are used | C．has been used | D．have been used |
Some people thought ________ possible to live on out space in the future .
| A．it | B．it be | C．it is | D．that is |
_____his poor health ,he was still at work late into the night.
| A． Despite | B．Besides | C． Apart from | D．In spite |
I don’t think that rock music is terrible , ______?
| A．do I | B．don’t I | C．is it | D．isn’t it |