– There are 60 students in my class and 45 of them use weibo very often.
– 45? That means about of your classmates are weibo users, right?
A. half B. two thirds C. three quarters
People who often stay up too late are more likely to die of heart disease，________ a study.
| A．with the help of | B．because of | C．according to | D．as a result |
He picked up an envelope________50 dollars in it.
| A．containing | B．contained | C．which contains | D．which was contained |
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 |