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