__ I do not know
what I ___________ without the suitcase you lent me.
__ Glad to have been of some help to you.
| A．would have done | B．would do | C．should have done | D．should do |
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 |
You will be successful in the interview __________ you have confidence.
| A．before | B．once | C．until | D．though |
—Where’s that report?—I brought it to you __________ you were in Mr. Black’s office yesterday.
| A．if | B．when | C．because | D．before |
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 |
It has been announced that candidates(应考者) ________ remain in their seats until all the papers have been collected.
| A．can | B．will |
| C．may | D．shall |