Scientists have found _____for oil as fuel. Coal, natural gas, solar power, nuclear power and even water can replace it as sources of energy.
| A．consequences | B．substitutes |
| C．requirements | D．contrasts |
The prize will go to the writer___story shows the most imagination
| A．that |
| B．which |
| C．whose |
| D．what |
I___through that bitter period without your generous help
| A．couldn’t have gone |
| B．didn’t go |
| C．wouldn’t go |
| D．hadn’t gone |
It___be the postman at the door.It’s only six o’clock
| A．mustn’t |
| B．can’t |
| C．won’t |
| D．needn’t |
I___sooner but I didn’t know that they were waiting for me
| A．had come |
| B．was coming |
| C．would come |
| D．would have come |
If you___smoke,please go outside
| A．can |
| B．should |
| C．must |
| D．may |