The old professor told us every part of the materials should be made use of ______ the power station.
| A．to build | B．building |
| C．build | D．built |
The moonlight was quite bright, and about fifteen yards up the road there was a deep ________ thrown by a tree.
| A．shade | B．shadow | C．shelter | D．reflection |
It is hard to say what kind of person he is. Sometimes he is very friendly; at other times he ___ be very cold.
| A．can | B．must | C．will | D．shall |
Doing your homework is a sure way to improve your test scores, and this is especially true ____ it comes to classroom tests.
| A．before | B．since | C．when | D．after |
—“Do you mind if I look at your notes?”
—“Of course not. _______.”
| A．No problem | B．Be my guest | C．With pleasure | D．Not at all |
Afghans used to hold big weddings, costing thousands of dollars, in a county _____ the average annual income is less than $400.
| A．which | B．whose | C．where | D．what |