Clean water and fresh air are essential for our daily life, _______ we can’t live.
| A．by which | B．without which | C．that | D．on which |
—Look,here comes your dream girl. Invite her to dance.
—______What if she refuses me?
| A．I don’t know | B．Why me? |
| C．With pleasure | D．So what? |
Evdence has been found through years of study______children’s early sleeping problem likely to continue when they grow up.
| A．why | B．how | C．whether | D．that |
The headmaster will not permit the change in the course,nor______it a thought.
| A．does he even given | B．he even gives |
| C．will he even give | D．he will even given |
It was 80 years before Christopher Columbus crossed the Atlantic______Zheng sailed to East Africa
| A．when | B．that | C．after | D．since |
Before you quit your job, ______how your family would feel about your decision.
| A．consider | B．considering |
| C．to consider | D．considered |