—Ben and Sue aren’t home, are they?
—No.They _____to London on business.
| A．have gone | B．go |
| C．have been | D．will go |
I am sure that if you _____________ your time, you’ll achieve greater success.
| A．make full use o | B．take use of |
| C．use up | D．are used to |
He got home late ____________ the traffic was heavy.
| A．because that | B．because |
| C．because of | D．in order that |
I think it was his attitude ___________ annoyed the teacher.
| A．which | B．what |
| C．that | D．to which |
I must say your food is excellent but your service really needs __________.
| A．to improve | B．improved |
| C．being improved | D．improving |
We _______ the difficulty together, but why didn’t you tell me?
| A．should face | B．might face |
| C．could have faced | D．must have faced |