Loulan, once a small, wealthy commercial city, is believed by many people___________over gradually by sandstorms from AD 200 to AD 500.
| A．covered | B．was covered | C．to be covered | D．to have been covered |
Only after her mother came to help her for the first few months _____ to begin her propjet.
| A．was she allowed | B．she was allowed |
| C．did she permit | D．she permitted |
I didn’t know that he was a cheat, or else I ________________ him.
| A．should have believed | B．shouldn’t believe |
| C．wouldn’t have believed | D．couldn’t believe |
Investment by Chinese companies in the US _____ rapidly in recent years.
| A．was growing | B．has been growing |
| C．had grown | D．will be growing |
After starting work, Cao spent his evenings _____ in his books and was eventually admitted to a secondary technical school.
| A．burying | B．buried |
| C．being buried | D．having buried |
The family _____ fans of Jay Chow, whose songs all sound familiar to them.
| A．were | B．was | C．are | D．is |