11. This bird’s large wings ________ it to fly very fast.
A) make B) cause C) enable D) ensure
12. In most of the United States, the morning newspaper is ________ by school-age children.
A) directed B) discharged C) derived D) delivered
13. Though the long-term ________ cannot be predicted, the project has been approved by the committee.
A) effect B) effort C) affect D) afford
14. Jane was fairly good at English, but in mathematics she could not ________ the rest of the students in her class.
A) put up with B) do away with C) keep up with D) run away with
15. He went ahead ________ all warnings about the danger of his mission.
A) in case of B) because of C) prior to D) regardless of
答案：11-15 BAACD
16. Because of the ________ emphasis placed on classroom work, the instructor will report your absences to the adviser.
A) large B) strong C) hard D) high
17. I have had great deal of trouble ________ the rest of the class.
A) coming up against B) making up for C) keeping up with D) living up to
18. The little man was ________ more than one metre fifty tall.
A) nearly B) quite C) hardly D) almost
19. Certain programs work better for some ________ for others.
A) and B) than C) as D) but
20. Some plants are so sensitive ________ pollution that they can only survive in a perfectly clean environment.
A) from B) against C) to D) with
答案：16-20 BCABC