五、根据短文内容和所给首字母，在空格内填入一个适当的词，使短文意思完整。
Conan Doyle became famous for writing stories about Detective Holmes. So he was often asked to solve difficult 1. p______.
One day, a woman told him a strange story. Her husband had been dead for five years and a grave(墓穴) had been 2. b______ for him. The grave was built like this: On the huge stone base(底部), there was a big stone ball. In the front of the ball, a cross was cut. What made the woman 3. s______ was that in winter the ball could move itself and the cross in it could not be seen at times.
Conan Doyle decided to help the woman 4. s______ the problem. He went to see the grave. The grave was just like 5. w______ the woman had told him before. Nobody could move the stone ball, and it was in a very shallow(浅的) hole in the stone base. There was water in the hole too. He 6. t______ for a minute and then said to the woman, “The problem is 7. e______ to explain. It's very cold and it often 8. r______ or snows here in winter. So there is always water in the hole. The water turns into ice at night. During the day, the southern part of the ice in the hole turns into 9. w______ again while the northern part of it still remains ice, so the stone ball leans(倾斜) southward little by little and the cross in the stone ball moves downward with the ball. As a result, the cross in the stone ball goes 10. m______ at times.”

1. problems 2. built 3. surprised 4. solve 5. what 6. thought 7. easy
8. rains 9. water 10. missing

六、根据语篇内容，用方框中所给词或短语的正确形式填空。
never against lock safe go out
How to protect oneself from criminals is one of the most important skills for teenagers. But how do we protect ourselves? Here are some 1. __________ tips for you.
* Don't 2. __________ by yourself at night.
* Keep away from strangers.
* 3. __________ carry a lot of money with you.
* Shut all the windows when you are out.
* Remember 4. __________ the door when you leave home.
* Don't give out your personal information on the Internet.
* Guard 5. __________ any possible danger around you.
* Call the police for help in time if you are in danger.
use when way highly out of control
Meanwhile, how to protect oneself from danger is also one of the most important skills for teenagers. But different situations mean different 6. __________ to deal with. Here are some examples.
Floods
* Get to 7. __________ ground and stay there.
* Don't walk through the flood water.
Earthquakes
* Stay calm when everything is 8. __________.
* Hide under a strong desk or table to protect yourself.
* Don't stand near a window.
Fires
* Try to get out as soon as possible.
* Cover your mouth and nose by 9. __________ a wet towel.
* Don't go back into the building on fire.
Traffic accidents
* Always follow traffic rules.
* Look left, right and then left 10. __________ crossing the road.
* Don't sit, walk or ride your bicycle on railways.
In short, keeping safe must come first. We need to learn to protect ourselves. Life is precious.

1. safety 2. go out 3. Never 4. to lock 5. against 6. ways 7. high
8. out of control 9. using 10. when