We couldn't see the road clearly the heavy snow.
| A．because | B．because of |
| C．so | D．though |
–_____ did you work out the problem in such a short time? --With Mr. Li’s help.
| A．When | B．Where | C．How | D．Which |
They walked home last night because they couldn’t _____ to take a taxi.
| A．leave | B．buy | C．afford | D．allow |
–Why didn’t you buy any bread? --Sorry, I _____.
| A．forget | B．forgot | C．remember | D．remembered |
They all _____ Laura about building a museum here.
| A．waited for | B．handed in |
| C．agreed with | D．knocked at |
Stop smoking, Joe! You _____ yourself if you keep on doing it like that!
| A．will kill | B．have killed |
| C．kill | D．killed |