Two strangers were sitting together in a plane . They were on a long journey . One of the men was a teacher . The other was a farmer .
They sat without talking for a while , then the farmer said , “ Let’s do something to pass the time .”
“ What do you want to do ?” the teacher asked .
“ We can ask each other riddles (谜语 ),” the farmer said, “ You start.”
“ Let’s make the rules first ,” the teacher said . “ And to make the game more interesting , let’s play it for money . If we don’t know the answer to the riddle , we have to pay a dollar .”
The farmer thought about this for a while , then he said , “ That’s not fair（公平 . You are a teacher , an educated ( 受过教育的) man . You know more things than I do . I am just a farmer .”
“ That’s true ,” the teacher said , “ What do you think we should do ?”
The farmer said , “ If you don’t know the answer to a riddle ,you pay me 100 dollars .If I don’t know the answer to the riddle , I’ll pay you 50 dollars.”
The teacher thought for a while , then he said , “ OK. That’s fair . Who’ll go first ?”
“I will ,” the farmer said . “ Here’s my riddle . What has three legs when it walks , but only two legs when it flies ?”
The teacher thought and thought , “ What has three legs when it walks, but only two when it flies ?” Then he said , “ That’s a good one . I don’t know the answer .” He gave the farmer 100 dollars and said , “ Tell me the answer . What is it ?”
“ I don’t know , either .” The farmer said , and gave him 50 dollars .
【小题1】At first the two men sat there without talking because ________ .

根据A句完成B句，使其意思相同或相近，每空填写一词。
1.A: What do you think of the movie Avatar（《阿凡达》）？
B: _______do you ________the movie Avatar?
2.A: He liked chocolate, and he liked biscuits,too.
B: he liked__________chocolate _________biscuits.
3.A: I hope I can forget all my problems.
B: I hope ________ ________all my problems.
4.A: I will fail the exam without your help.
B: If you _______help me, I won’t _______the exam.
5.A: In her eyes, the cute dog is her best friend.
B: She_______the cute dog________her best friend.

You’ll fail the exam _____ you work hard. 

根据括号内的要求改写下列句子，每空一词。
【小题1】Study hard, or you’ll fail the exams. (改为同义句)
_________ you _________ study hard, you will fail the exams.
【小题2】Mary is good at writing Chinese words. (改为同义句)
Mary _________ well _________ writing Chinese words.
【小题3】“I can sing some English songs.” Li Ming said. (变为间接引语)
Li Ming said _________ _________ sing some English songs.
【小题4】 She went shopping last Sunday. (改为同义句)
She _________ _________ shopping last Sunday.
【小题5】We will go somewhere to have a picnic. (改为否定句)
We _________ go _________ to have a picnic.

You’ll fail the test______ you work hard.

A．if                B．since             C．unless            D．when