The first week of university is an exciting time _______ freshmen familiarize themselves with their college and make new friends.
| A．that | B．when | C．what | D．on which |
I didn’t hear the phone. I ________ asleep.
| A．must be | B．must have been | C．should be | D．should have been |
—Does he know how to work out the problem?
—Yes，he has ________ a good idea to solve it.
| A．caught up with | B．kept up with | C．come up with | D．put up with |
The trip will take about five months；it will be a long time ________ we meet them again.
| A．after | B．before | C．since | D．when |
This kind of medicine has a bad ________on our brains.
| A．affection | B．affect | C．effect | D．result |
The chance I had been looking forward ________ at last.
| A．to came | B．to come | C．to comes | D．to coming |