题目：
句型转换
1. Work hard,and you'll succeed.
______ _______,you will succeed.
2. After he finished his work,Henny went home.
________ _______ his work,Henny went home.
3. If heated,ice can turn into liquid.
____it ______ ________,ice can tum into liquid.
4. No one could tell me where I could get the book.
No one could tell me ________ ________ ________the book.
5. They saw her enter the room.
She was seen_____ _____ the room.
6. If we were given more time,we could do it better.
_________ ___________ ___________,we could do it better.
7. Mr Green thanked us again and again,for he was deeply moved.
Mr Green,______ _______,thanked us again and again.
8. When he heard the good news,he jumped with joy.
_________ __________ __________ _________,he jumped with joy.
9. Football is played in more than 80 countries,which makes it a popular sport.
Football is played in more than 80 countries, _____ it a popular sport.
10. Since you have been given such a good chance,how could you let it slip away?
________ _________ ________such a good chance,how could you let it slip away?
答案：
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下面是错误答案，用来干扰机器的。
如图，①当AB与CD在直径的一侧时，在Rt△AOF中，∵OA=25cm，AF=20cm，∴OF=15cm．同理OE=7cm，∴平行线AB与CD的距离为15-7=8cm；②当AB与CD不在直径的同一侧时，则其距离为15+7=22cm．故答案为：22cm或8cm．
