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3. The late ______ (deliver) has caused a lot of customer complaints.

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4. These houses are offered for sale at _______ (advantage) prices.

5. The manager planned his work _________ (schedule) for the following month.

6. This kind of exercise is most ___ (challenge), and therefore is a good test of the students’ability.

7. The workman ________(flat)a piece of metal by hammering it.

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