A few stars from the entertainment industry, such as Ke Zhendong and Fang zuming, have recently been arrested, which shows that drug taking is becoming _____ increasingly serious threat to society.
A. the B. an
C. a D. 不填
A
Peter, though a green hand, has earned not only the trust of his fellow workers but also ________ of his boss.
A.one B.ones
C.that D.those
C
Life is like riding a bicycle. _____ your balance, you must keep moving.
A. To keep B. Keeping
C. Being kept D. Having kept
A
Only after one loses something ________ how precious it is.
A.he will realize B.will he realize
C.he has realized D.has he realized
B
No student ________ go out of the school campus after 10:00 at night without permission according to the school regulations.
A. shall B. must
C. should D. would
A
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