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Running a company is not _______ a matter of hiring people — they also need to be trained.

A. simply????? B. partly????? C. seriously????? D. equally

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

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

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

My sister is _______ about what she eats, otherwise she would not be so thin.

A. special?????? B. curious??????? C. particular?????? D. specific

They paid fifty percent of _____ they were able to earn to the state．

A．that????????? ????????????? B．which???? ????????????? C．what???????? ????????????? D．whom

Leonardo da Vinci (1452-1519) ____ birds kept in cages in order to have the pleasure of setting them free.

A. is said to be buying?????????? ????????????? B. is said to have bought

C. had said to buy?????????????? ????????????? D. has sad to have bought

Remember that you won't be able to cancel the contract ____you've signed.

A. before??? B. until?????? C. once?? D. though

______ a certain doubt among the people as to the practical value of the project.

A. It has???????????? B. They have????? C. It remains???????? D. There remains

I ordered _______pizza and salad. _______ pizza was nice but the salad was terrible.

A.a;The???????? B. a;不填??????????? C.the；the?????????? D. the；不填