It is important( )the hotel receptionist should make sure that guests are registered correctly.
A. that
B. what
C. which
D. for
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He seems to be( )about something.
A. worrying
B. to worry
C. to have worried
D. having worried
At the end of each dinner at home, all the rubbish should( ).
A. be got of
B. be got rid of
C. be got off
D. be got rid
Potato, tomato, green vegetable, sweet corn, mushroom, etc. are the most famous farming products( )the farming field.
A. coming from
B. coming out
C. coming into
D. coming across
It's raining now,( )go out until after the rain.
A. let's don't
B. don't let's
C. let's
D. let's not
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