The house rent is increasing sharply nowadays. I’ve got about half the space I had five years ago but I am paying _______ now.

Chinese students usually spend ______ the students of the US studying in their free time.

Possibly encouraged by Liu Xiang, a number of students want to have a try in the        hurdle race.

. There are    students in our schoo1.

The Yellow River is _____ the Pearl River.
A twice long as               B twice as long as        
C as twice longer as           D as long twice as

He used to visit his parents _____, but he is too busy to call on them now.
A every second weeks        B every two weeks
C every a few weeks         D every two week

In         , when he was in       , he went to California to seek his fortune.

The boy failed four times, but he said he would try ___________.

9．When ______ at the ticket office, my brother and I found we didn’t have enough money to buy tickets for ______ of us.

The moon is          the earth .