It may be necessary to stop ________ in the learning process and go back to the difficult points in the lessons.

A．at a distance

B．at intervals

C．at case

D．at length

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1 The Twiggs claimed custody rights to Kimberly because ________.

A．they found her unhappy in M Mays’ custody

B．they regarded her as their property

C．they were her biological parents

D．they felt guilty about their past mistakeC

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2 Kimberly had been given to Mr. Mays ________.

A．by sheer accident

B．out of charity

C．at his request

D．for better care

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3 You can hire a bicycle in many places. Usually you’ll have to pay a ________.

A．deposit

B．deal

C．fare

D．fond

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