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 sun.

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