1 . —I hope I can take part in the game show Who is Still Standing and win something.
—Stop daydreaming. You will win nothing ________ you spend a few months preparing for it.

A．since

B．unless

C．if

D．because

2 . —It has been much easier for me to go to work          shared bikes appeared.
— But they also caused plenty of problems.

A．since

B．before

C．unless

D．though

3 . —What do you think of your junior high school life?
—I think it is enjoyable,   _________ I sometimes have some trouble in study.

A．if

B．though

C．while

D．until

4 . When we work, we must practice our skills constantly and continuously ________ we excel in what we do. （用适当的词填空）

5 . In the summer of 1405, Zheng He, one of China’s greatest explorers, set sail from Taicang on his first voyage. A fleet of over 200 ships navigated the blue seas. It would take 500 years _____________ a larger fleet sailed the seas. (用适当的词填空)

6 . At the same time, Miss Brown quickly opened the classroom door,____________________ it became damaged during the shaking and could not open. (根据句意填空)

7 . 约翰，坐在我能看见你的地方。
John, sit ________________. (where引导的地点状语从句)

8 . 无论什么时候你来到这家书店，你总会看见一些求知似渴的人。(whenever引导让步状语从句) （汉译英）

9 . 每当我必须演讲时，在开始前，我都变得非常紧张。(whenever引导时间状语从句) （汉译英）

10 . ________ we deal with our problems, we can easily become unhappy.

A．Unless

B．Until

C．Though

D．Whether