1 . I saw a man shouting at a driver yesterday ________ car was blocking the street.

A．that

B．who

C．when

D．whose

2 . —How long will it be________ the professor makes another visit to China?
—It all depends.

A．until

B．before

C．since

D．when

3 . No one can get access to the website and download any information from it ______ a correct password is entered.

A．because

B．unless

C．when

D．since

4 . With the entrance exam approaching, I feel more and more stressed. It will ruin my college dream ________ I take action now as soon as possible.

A．if

B．once

C．unless

D．when

5 . We were playing in the park happily ________ it suddenly started to rain.

A．while

B．since

C．after

D．when

6 . _______ many Brits like nothing better than spending their Sunday cutting the grass, some are happy just to sit under the branches of the tree and enjoy the beauty of the world around them.

A．When

B．Like

C．As

D．While