________ she has made up her mind, nothing can change it.
| A．Unless | B．Once | C．Although | D．As soon as |
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 |
-Is it all right if I sit here?
-__________，sir. The seats are for elderly people only.
| A．Better not |
| B．Go ahead |
| C．As you please |
| D．No way |
She knows that as a secretary she must be pleasant and helpful no matter __________ busy she is or what kind of __________ she may be in.
| A．what; mind |
| B．how; mood |
| C．which; form |
| D．how; thought |
He can __________ his breath under the water for five minutes.
| A．keep |
| B．hold |
| C．take |
| D．make |
After several sleepless nights, Mr Johnson __________ a perfect solution to the financial problems of his company.
| A．kept up with |
| B．put up with |
| C．came up with |
| D．ended up with |