3.[!-]here hear　　　　　　　 4.[G]photo laugh

1.[-]weather whether　　　　 2.[(]good pull

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Last Wednesday we (1)　　 an experiment in our physics lab. First we filled a kettle (2)　　 water and marked the level of water. Next we boiled the kettle of water for 15 minutes. Steam could be seen coming (3)　　 of the spout. Then we held a cold dry plate in

　　　 (4)　 steam. Little drops of (5)　　 were found on the plate. We again (6)　　 the level of water in the kettle. The level (7)　 found to be lower, because some of the water had been turned (8)　　 vapour as the kettle boiled.

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-One day, the wife of a Chinese king sat watching a worm as it ate some mulberry leaves(桑叶). Soon it stopped (9)　　 . Then, as it slowly turned its head from side (10)　　 side, a very fine thread came out of its (11)　　 . It wrapped the thread around and around itself until it was shut (12)　　 a little cocoon.

"If a worm can wind (缠绕)this fine thread around itself, why can't I unwind it and use 　　(13)　　 ?" the queen thought.She tried to do this. She didn't succeed at first. But she kept trying until she finally succeeded. Soon she and her people (14)　　 keeping worms. They took this shining thread and used it to make beautiful cloth. This cloth was called silk. Whether this is true　　 (15)　　 not, it is an interesting story.

One day a middle-aged woman wrote to a doctor (1)　　 him to have dinner at her house. The doctor wrote a reply but he wrote so carelessly that the woman (2)　　 (not)it.

"What shall I do?" she asked her husband. "I (3)　　 (not)if he's going to come or not. I don't want (4)　　 him and say I can't read his writing."

Her husband (5)　　 for a while and said: "Take it to the chemist. He will be able to read it."

The woman went to the chemist's shop and (6)　　 the doctor's note to the chemist. He looked at it very carefully.Then he　　 (7)　　 on his glasses and looked at the note more closely.

"Could you (8)　　 a moment,Madam?" he said.

He went to the back of his shop.After a few minutes he returned, (9)　　 a bottle.He gave the bottle to the woman.

" (10)　　 this medicine three times a day," he said!

11.Lincoln not only set the slaves free but also reunited the nation.

Not only (19)　　 Lincoln (20)　　 the slaves free, he also reunited the nation.

10.You'll be late unless you catch an early bus.

You'll be late (17)　　 you　　 (18)　　 catch an early bus.

9.The dustmen went on strike because they were badly paid.

If the dustmen had been well paid they would not (15) (16) on strike.

8.Bob is always busy but he never refuses to help others.

Busy　　 (13)　　 he always (14)　　 ,Bob never refuses to help others.

7.Some day China will catch up with the highly developed countries. You will see that day.

You will see the day (12)　　 China catches up with the highly developed countries.