The teacher stressed again that the students should not ___ any important details while retelling the story.
| A．leave out |
| B．let out |
| C．come out |
| D．make out |
Tourists are now coming to Ping’an village in large numbers, ___________ they would never have stopped, had it not been Mo Yan’s hometown.
| A．when | B．where | C．that | D．which |
It is reported that in our country cities ________ heavy air pollution that is 30 percent above the national standard or higher should try to meet standards by 2030.
| A．suffering | B．suffer | C．suffered | D．are suffering |
It's ten years since the scientist _______to discover the valuable chemical.
| A．kept up | B．set out | C．took in | D．set about |
I called Bruce many times yesterday, but I couldn’t get through. His brother ____ on the phone all the time.
| A．was to talk | B．was talking | C．would be talking | D．had talked |
Although Fleming discovered Penicillin, it was over a decade ______ someone else turned it into the great drug of the 20th century.
| A．before | B．since | C．when | D．as |