题目内容：

In the United States there was an unusual story telling of the daughter of an engineer. One day    walking along the bank of a lake, the girl happened to see 20 eggs laid by a wild goose(鹅). After some time the girl    the mother would not return to the eggs and she    to take them home. There she carefully    the eggs in the heat of a lamp. Several days    , the eggs broke and the baby geese came into the    .

    Geese are known to take the first living thing        theysee as their mother. Thus, to these    geese, the girl was their mother.

As they grew, the girl was able to    her birds to run across the grass, but she could not teach them to    . The litter girl became increasingly worried about this, both when    and in her dreams. Suddenly, she thought    a clever idea: she would fly a plane to guide them in    . She asked her father for a plane and he made a small one for her. Caring about    safety, the father flew the plane himself. However, the birds didn’t    him. They all slept in the grass    .

The girl was so worried about it that one day the girl    into the plane and started it. Soon the plane left the    . Seeing their mother in the air, the birds    expanded their wings and    . She flew the plane freely in the sky, with her young birds following.

1.A. since       B. after C. whileD. because

2.A. realizedB. expectedC. imaginedD. admitted

3.A. helpedB. decidedC. affordedD. agreed

4.A. placedB. protectedC. treatedD. examined

5.A. agoB. outC. laterD. long

6.A. familyB. houseC. homeD. world

7.A. whatB. whichC. thatD. who

8.A. greatB. bigC. shyD. young

9.A. askB. leadC. wantD. allow

10.A. flyB. raceC. swimD. sing

11.A. asleepB. awayC. aroundD. awake

12.A. ofB. throughC. overD. back

13.A. skyB. heavenC. flightD. plane

14.A. hisB. herC. theirD. its

15.A. respectB. rememberC. followD. receive

16.A. sadlyB. insteadC. hardlyD. too

17.A. climbedB. lookedC. droveD. fell

18.A. houseB. floorC. waterD. ground

19.A. secretlyB. disappointedlyC. patientlyD. immediately

20.A. looked awayB. set outC. went byD. turned back