Parking is limited ________ 30 minutes. You can only park for 30 minutes.

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Which is ________ country, Canada or England?

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He gains his ________ by printing ________ of famous writers.

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

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—Nancy is not coming tonight.

—But she ________

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—Little lily didn't come to the party yesterday.

—I ________ him last night but I was too busy.

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A．should telephone

B．had to telephone

C．should have telephoned

D．ought to telephone

—Must I clean the room now?

—No, you ________.

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Brue ________ go to school today, for he has had a bad cold.

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Petty ________ you help, even if she was very busy.

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The doctor did all he could in order that he ________ save the child's life.

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