Do you think ____ life on Mars? [ ]A. it exists B. there exists C. it

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Do you think  ____  life on Mars?  [     ]
A. it exists
B. there exists
C. it is existed
D. there is existed

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举一反三

To have a family reunion dinner at a restaurant, you need to   reserve the restaurant and select
dishes on the menu months    before it,____?    [     ]
A. don"t you
B. didn"t you
C. mustn"t you
D. needn"t you

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We live day by day, but in the great things, the time of days and weeks____ so small that a day
is unimportant.      [     ]
A. is
B. are
C. has been
D. have been

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Children under sixteen are not permitted to see such kind of  films as _____ bad for their mental
development.   [     ]
A. was
B. were
C. is
D. are

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Nowadays,  the iron and steel industry _____ the key link  in socialist production.   [     ]
A. is
B. are
C. was
D. were

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_____ not only you but also Jack going to China nextweek?    [     ]
A. Are
B. Is
C. Were
D. Was

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