1. It is quite obvious that the aging population in China will cause _____heavy pressure on _____whole society in near future.

A. a; a         B. a; the          C. the; a               D the, \

2 The great difficulty I had _____ the patient who received a serious wound was unimaginable.

A. treat        B. to treat                      C. treating                D. treated

3  With all these dishes ______, I can't go and listen to the speech by the famous professor.

A. to wash         B. to be washed         C. washed                 D. washing