Half an hour has been made full ______ of _____ the problem.
| A．using; studying | B．use; to study | C．to use; to study | D．use; studying |
His father often comes back from work at 10 o’clock at night _______ his mother is waiting for him.
| A．that | B．when | C．where | D．which |
His speech was heard by a group of five judges , all of_____agreed that it was the best.
| A．whom | B．who | C．them | D．that |
Electricity is not easy _________ when an earthquake happens.
| A．to get | B．to be got | C．getting | D．get |
Mary wanted to ______ her experiment, but her parents encouraged her to continue.
| A．give up | B．give in | C．give out | D．give away |
He is _________ and I believe he can keep the secret for you.
| A．determined | B．stubborn | C．reliable | D．frightened |