The newspaper's owner and editor ___ away on holiday.
| A．is | B．are | C．be | D．have been |
No, I’m too busy right now. Please give me an hour, _____?
| A．do you | B．don’t you | C．am I | D．OK |
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 |