单句改错。
1. Please accept my congratulation on your marriage.
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2. The Great Wall is worth of being visited.
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3. I'll do what I can to help you in return your help.
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4. Occasions are quite rare which I have the time to spend a day with my kids.
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5. Three-fourths of the homework have been finished.
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6. Tom's mother kept telling him stories he was interested in them.
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7. Judged from his accent, he must be from America.
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8. Betty shows great interest in this poem now, but she thought it boring for the
first time she read it.
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9. When the fire broke out, many workers escaped the building.
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10. To our great surprise, the scientist devotes all his life to observe the su
n.
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，求
．