下列各题中有一处错误，请改正。

1. ---Do you usually come to school by bike?  ---Yes, I am.

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2. Do you like watch TV?

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3. She doesn't does housework on Saturday.

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4. Amy usually listens music after supper.

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5. I very like singing English songs.

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6. What do you often do in Sunday evenings?

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7. Do you enjoy chat with friends on the Internet?

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8. Can he swims?

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9. He studys at No.1 Middle School.

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10. Tom, would you like to play with I?

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为了保证列车行车安全，信号、道岔与进路之间必须保持一定的制约关系和操作顺序，这种制约关系和操作顺序叫做（）。