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 |
Since nobody gave him any help, he ______ have done the research on his own.
| A．can | B．must | C．would | D．need |
I was wondering what to do with my car which won’t start ______ a kind man offered to help.
| A．while | B．and | C．so | D．when |
---Why does Peter look upset?
--- He is a newcomer to the class and is having difficulty ______ by his classmates.
| A．accepted | B．to be accepted |
| C．accepting | D．being accepted |
Her question was so difficult that I could hardly make any _______ of it at all.
| A．explanation | B．meaning | C．sense | D．idea |
Human beings are different from animals _____ they can use language as a tool to communicate.
| A．in that | B．for that |
| C．in which | D．in which |