Rather than ______ on a crowded bus, he always prefers _____ a bicycle.
| A．ride, ride | B．riding, ride | C．ride, to ride | D．to ride, riding |
The government has taken some measures to solve the shortage of electricity, but it may be some time ______ the situation improves.
| A．since | B．when | C． before | D． unless |
He reminded me that the poor weather may have ＿＿＿ the small crowd.
| A．turned up | B．spied on | C．accounted for | D．came across |
I have no idea ＿＿＿ David is in trouble, he will turn to you for help.
| A．if | B．that | C．when | D．that if |
Who do you think Mr. Brown had ＿＿＿ within three months?
| A．driven | B．driving | C．drive | D．to drive |
The most useful learning in the world is that ＿＿＿ teaches us how to die well.
| A．that | B．which | C．/ | D．who |