When on holidays, the railways put on _______trains to make people’s travel more convenient．
| A．special | B．regular | C．particular | D．unusual |
Hissisterlefthomein1998,and_________since then.
| A．hadnotbeenheard | B．hasnotbeenheardof |
| C．hadnotheardof | D．hasnotheardof |
Thepoliceman’s_________trafficdirectionsmadeallthedriversquite ___________.
| A．confused;confused | B．confusing;confusing |
| C．confused;confusing | D．confusing;confused |
The president is talking on ____ phone with astronauts in ____ space.
| A．不填；the | B．the; the | C．the; 不填 | D．不填；不填 |
The chief editor demanded that the article _________ immediately.
| A．must be submitted | B．would be submitted | C．submits | D．be submitted |
He decided not to say anything at the meeting unless_________.
| A．asking to | B．to ask to | C．asked to | D．ask to |