Only when your identity has been checked, ________.

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The old couple have been married for 40 years and never once ________ with each other.

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－The boys are not doing a good job at all, are they?

－________.

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Only in this way ________ to make improvement in the operating system.

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－You forgot your purse when you went out.

－Good heavens, ________.

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Not only ________ interested in football but ________ beginning to show an interest in it.

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A．the teacher himself is; all his students are

B．the teacher himself is; are all his students

C．is the teacher himself; are all his students

D．is the teacher himself; all his students are

Since you have repaired my TV set, ________ is no need for me to buy a new one.

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So difficult ________ it to live in an English-speaking country that I determined to learn English well.

[　　]

Not a single song ________ at yesterday's party.

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What a pity my new computer doesn't work! ________ must be something wrong with it.

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