People have come to understand _____ prevents so many Americans from being as happy as one might expect.
| A．that it is why | B．what does it that | C．why it does that | D．what it is that |
It was ten o’clock _______ we got to the top of the hill.
| A．that | B．when | C．which | D．since |
_____ you take a taxi, you’ll still miss your train.
| A．As long as | B．As soon as | C．Even if | D．As if |
_____ no need _____ the radio since I’ve been used to working with it on.
| A．It’s; to turn down | B．It’s; turning up | C．There’s; turning off | D．There’s; to turn off |
It is in Qingdao ______ you are going to pay a visit to _____ this kind of washing machine is produced.
| A．/; that | B．where; which | C．/; where | D．what; which |
The number of the employees has grown from 1,000 to 1,200. This means it has risen ____ 20 percent.
| A．by | B．at | C．to | D．with |