4. Scientists are searching          more information about Mars.

3. Her age is        45 and 50.

2. What do you know        the spaceships?

1. Mars looks        a red and orange ball.

(   ) 5. The little girl is          young          go to school.

A. so; that    B. too; to

C. such ; that D. enough ; to

(   ) 4. It        us three hours to do the housework yesterday.

A. will take    B. takes

C. is taken     D. took

(   ) 3. It          a long time since we reached Beijing.

A. is          B. was

C. has been    D. had been

(   ) 2.        of our classmates are good at basketball.

A. Two fifths     B. Two fifth

C. Second five    D. Two five

(   ) 1. We spend twenty-eight days          this book,because it is too difficult.

A. finish       B. finishes

C. finishing    D. to finishing

 用方框内单词的适当形式填空。

1. We have to          the use of paper,because making paper waste much wood.

2. They have visited many places of interest,so they have a wonderful        .

3. Because the forests were cut down,there are some          in the north of China.

4. The          on the surface of the moon is one sixth of the earth.

5. —How heavy is the box?

—It        about 56 kilos.