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6 I had some difficulty in carrying out the plan.

A making

B keeping

C changing

D implementing

7 Mr. Johnson evidently regarded this as a great joke

A readily

B casually

C obviously

D simply

8 We all think that Mary's husband is a very boring person.

A shy

B stupid

C dull

D selfish

9 The workers in that factory manufacture furniture.

A promote

B paint

C produce

D polish

10 They only have a limited amount of time to get their points across

A large

B total

C small

D similar

参考答案：6. D 7. C 8. C 9. C 10. C