1 . From space, the earth looks blue. This is ________ about seventy-one percent of its surface is covered by water.

A．what

B．how

C．because

D．why

2 . I was looking at the photos on the noticeboard ________ I heard a voice behind me. (用适当的词填空)

3 . Look out! Don't get too close to the house________ roof is under repair.

A．which

B．whose

C．of which

D．where

4 . Tom was absent. That was_______he was ill.
Tom旷课了。那是因为他病了。

5 . Many senior students have just reached a point _____ they can control their moods and actions.

A．where

B．that

C．when

D．which

6 . You were very impolite to him, for _____ you should make an apology to him, I think.

A．this

B．which

C．what

D．that

7 . __________ is no possibility __________ Bob can win the first prize in the match .

A．There ; whether

B．There ; that

C．It ; whether

D．It ; that

8 . My brother bought a telescope, ______ he could study the star in the night sky.

A．of which

B．through which

C．in which

D．on which

9 . I got to love Hangzhou ______ I went there in 2001 and that was the first time that I ______Longjing Tea．

A．the first time; had tasted

B．for the first time; had tasted

C．the first time; have tasted

D．for the first time; tasted

10 . It rains a lot these days， _______ prevents us from going out.

A．it	B．that
C．this	D．which