6. This kind of exercise is most ___ (challenge), and therefore is a good test of the students’ability.
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7. The workman ________(flat)a piece of metal by hammering it.
8. A (n)__________(add) charge is made for heavy baggage.
9. Something should be done about this as a matter of ________ (urgent).
10. This restaurant is an excellent place for ________(entertain) business guests.