4. These houses are offered for sale at _______ (advantage) prices.
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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.
8. A (n)__________(add) charge is made for heavy baggage.