—I suggest we set up an out-of-class club.
—Great! That’s exactly what I ______.
| A．was thinking | B．think | C．had thought | D．will think |
Most birds find it safe to sleep in the trees, but ____ they have eggs or young chicks, they don’t use a nest.
| A．why | B．how | C．unless | D．where |
___ the silence of the pauses, we could hear each other’s breathing and could almost hear our own heartbeats.
| A．In | B．For | C．Under | D．Between |
You will be successful in the interview ____ you have confidence.
| A．before | B．once | C．until | D．though |
The field research will take Joan and Paul about five months; it will be a long
time ____ we meet them again.
| A．after | B．before | C．since | D．when |
1 won’t call you, ________ something unexpected happens.
| A．unless | B．whether | C．because | D．while |