It is only with the help of scientific research _____ bring PM1 air pollution under control.
| A．that we will | B．we will |
| C．that we do | D．do we |
Have you heard that he, as well as his parents, ______ visited the Summer Palace?
—Really? No ______ he didn’t attend the meeting.
| A．have; doubt | B． has; choice | C．have; reason | D．has; wonder |
Only ______ a human being.
| A．when is it hungry a lion will attack | B．when it is hungry a lion will attack |
| C．when it is hungry will a lion attack | D．when is it hungry will a lion attack |
Don’t ______ a person only because he has failed in an examination.
| A．look up | B．look down | C．look down on | D．look up to |
I wanted to catch ______ early train, but couldn’t get ______ ride to the station.
| A．an; the | B．/; the | C．an; / | D．the; a |
What he said at the meeting means _______ those who had cut down the forests.
| A．to argue against | B．to argue for |
| C．arguing for | D．arguing against |