Is_____ necessary ____them to stop ________ every two hours?
| A．that; for; resting | B．that; of; to rest | C．it; for; to rest | D．it; of; resting |
Not until they left school________how much their teachers loved them and helped them.
| A．they realized | B．did they realized |
| C．the would realized | D．had they realized |
It’s nice to see you again. What_________ since we last met?
| A．have you done | B．had you done |
| C．have you been doing | D．did you do |
--- Shall we take the 10:20 train?
--- No. If we took that train, we ________too late.
| A．arrive | B．arrived | C．will arrive | D．would arrive |
--- I had thought he would be nervous in this speech competition, but he turned out to be calm.
--- He________quite enough preparation for it.
| A．should do | B．must do | C．should have done | D．must have done |
Don’t give up regardless of difficulty and failure, ________ you’ll never achieve your goals.
| A．and | B．but | C．or | D．so |