They paid fifty percent of _____ they were able to earn to the state．
A．that B．which C．what D．whom
My sister is _______ about what she eats, otherwise she would not be so thin.
A. special B. curious C. particular D. specific
I know a little bit about the city as I __________ there for one year in my youth.
A. am studying B. had studied C. studied D. have studied
While working in the countryside, the students a great deal of knowledge on plant life.
A. looked up B. picked up C. put up D. called up
Criticism and self-criticism _____ necessary _____ it helps us to correct mistakes.
A. is, in that B. are, in that C. is, in which D. are, at that
Running a company is not _______ a matter of hiring people — they also need to be trained.
A. simply B. partly C. seriously D. equally
