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We are just _____ calling you up _____ you come in.

A. about; when      B. on the point of; while

C. on the point of; when      D. on the point of; as

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The college entrance examination is coming, the students are _____ it.

A. preparing    B. prepared for     C. prepared    D. preparing for

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The teachers are doing what they _____ their stuaits.

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Everybody in the little town knew my first teacher, so we had no _____ finding his home.

A. difficulties in  B. difficulty with   C. difficulty  D. difficulty to

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