You ________ play football in the street. It's too dangerous.

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This coat isn't so ________ as that one.

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All the students are ________ in sports.

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I can't find my key ________.

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We arrived ________ a small village two weeks ago.

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Mr Li has taught English in this school ________.

[　　]

A．twenty years before

B．twenty years ago

C．twenty years long

D．all his life

I know ________ is good for us to read English every day.

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Physics is more interesting than ________ subject.

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________ will your father be back home?

He said he would be back in three weeks.

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________ have you written to your pen friend? Once a month.

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