Seldom( ) any mistakes during my past five years of service here.

A. made I B. did I make

C. should I make D. would I make

A. That B. what

C. Which D. Whether

A. did it B. didn‘t it

C. do it D. does it

A. didn‘t he B. didn’t they

C. did he D. did they

A. didn‘t he B. didn’t they

C. did he D. did they

A. that B. as

C. although D. however

A. so diligent B. such diligent

C. so much diligent D. such very diligent

A. whatever B. how

C. no matter D. however