6. The man^'s -------------- in solving math problems is very little.

1) mystery

2) passage

3) reward

4) knowledge

7. At last we found out who had -------------- the watch.

1) stolen

2) known

3) pulled

4) woken

8. Why did you have to go and tell Bob about my illness?
 Can^'t you keep a --------------.

1) secret

2) bill

3) light

4) mistake

9. She explained all the story again, but l still didn't --------------.

1) wait

2) understand

3) face

4) pick up

10. Don^'t you want to give back the money you -------------- from me?

1) picked

2) decided

3) borrowed

4) sailed

11. A -------------- is a thing that children like to play with.

1) rock

2) hammer

3) slice

4) toy

12. -------------- trying. You^'ll soon learn how to do the puzzle.

1) Pick up

2) Give back

3) Take off

4) Keep on

13. You can -------------- how to answer the question correctly if you try hard.

1) take off

2) turn on

3) find out

4) pick up

14. When she turned off the light, the eyes of the cat began to glow in the --------------.

1) sail

2) slice

3) dark

4) space

15. The cameras in the spaceships have taken -------------- pictures of the moon.