阅读下面短文，用括号内所给动词的适当形式填空(必要时可加情态动词或助动词)

A farmer had some dogs to sell. He painted a sign advertising the dogs. A little boy came up to him and said, “Sir, I want to buy a dog.”

“Well,” the farmer said, “but they1._____________________ (be) very expensive.” The boy 2. _____________________ (take) some changes out of his pocket, “I’ve got thirty-nine cents. Is that enough to take a dog?”

“Sure. I have six dogs. You3. ________________________ (choose) any of them.” Then the farmer whistled, “Dolly!” At once, Dolly ran out of the doghouse followed by four little dogs. Then the little boy’s eyes4.____________________________ (dance) with happiness.

But the boy saw another little dog5.___________________________ (move) out slowly. This one was the smallest. She was trying her best 6. _________________________ (catch) up with the others…

“I went that one,” the boy said, 7. ____________________________ (point) to the last one. The farmer was surprised. “She 8. _________________________ (not run) and play with you like other dogs. Will you still want to buy her?” he said kindly.

Hearing that, the little boy rolled(卷起) up one leg of his trousers. A steel brace(支架) 9. _____________________ (tie) on both sides of his leg. Looking up at the farmer, he said, “So you see, Sir. I can’t walk very well myself, I 10. ____________________________ (understand) her. So we will be good friends.”

If someone is lost in a forest( 森林 ), he needs only study the trees around him carefully to find his way. On this half of the earth, he will find that the side of the tree with the most leaves and branches(树枝 ) is the south side. Also, by checking the tops of the trees, he will find that they lean(倾斜 ) to the south too.
Another sign( 标志物) for him to know where he is going is found in the bark.( 树皮) That is brighter on the south side.The remanining(树桩 ) of a cut tree is also a finder, for its rings can give him another sign. The rings will be thinner on the south side and thicker on the north side.
One more sign: some very small plants grow at the foot of a tree and they point to the north.
【小题1】 The passage is mainly about __________.
how to find a big tree if one is lost in the forest.
How to cut down trees in the forest
How to find the direction(方向 )in the forest
How to grow trees in the forest .
【小题2】 From a cut tree we can know that ___________.

If someone is lost in a forest( 森林 ), he needs only study the trees around him carefully to find his way. On this half of the earth, he will find that the side of the tree with the most leaves and branches(树枝 ) is the south side. Also, by checking the tops of the trees, he will find that they lean(倾斜 ) to the south too.

  Another sign( 标志物) for him to know where he is going is found in the bark.( 树皮) That is brighter on the south side.The remanining(树桩 ) of a cut tree is also a finder, for its rings can give him another sign. The rings will be thinner on the south side and thicker on the north side.

  One more sign: some very small plants grow at the foot of a tree and they point to the north.

1. The passage is mainly about __________.

A. how to find a big tree if one is lost in the forest.

B. How to cut down trees in the forest

C. How to find the direction(方向 )in the forest

D. How to grow trees in the forest .

2. From a cut tree we can know that ___________.

     A. the direction is written on it

     B. the rings will be thinner on the south side and thicker on the north side

     C. the rings will be thinner on the south

     D. its rings can send messages to you

3. The passage tells us __________ ways of finding the direction in the frorest.

     A. three      B. four      C. five      D. six