People have always been curious ______ how living things on the earth exactly began.
| A．in | B．at | C．of | D．about |
How about taking short break? I want to make — call.
| A．the ,a | B．a ,the | C．the ,the | D．a ,a |
It is demanded that the plan _____ out as soon as possible.
| A．must be carried | B．is to carry out | C．carried | D．be carried |
Generally speaking, employers should not _____ themselves in the private matters of their staff.
| A．remind | B．inform | C．understand | D．involve |
—How was your journey last week?
—Very interesting. The people there still keep the custom _____ the Ming Dynasty, which is different from other areas.
| A．dating back to | B．dating back | C．dated back to | D．dated back |
—Have you sold your house?
—No. Last week only four people came to look at the house, _____ wanted to buy it.
| A．none of them | B．none of whom | C．neither of them | D．neither of whom |