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 |
A ship in the harbor is safe，but that’s not __________ ships are built for．
| A．what | B．that | C．why | D．how |
In Europe unemployment hit a new record with young people __________ it harder to get jobs．
| A．to find | B．finding | C．having found | D．found |
Nelson Mandela is，__________ the greatest man of the 20th century，certainly among the most extraordinary leaders．
| A．if there | B．if any | C．if not | D．if so |
--- Look，someone has left the fridge door open again．
--- Well．It __________ me，Morn．
| A．isn’t | B．won’t | C．hasn’t been | D．wasn’t |
You fool! You __________ all the people in the car yesterday if it had not been for me．You were so drunk while driving!
| A．could kill | B．might have killed |
| C．had killed | D．should have killed |