It is everybody's () to keep the city clean.
A. matter
B. affair
C. business
D. thing
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The manager considers Kate ()the most productive employee in the team
A. about
B. as if
C. for
D. to be
Julio ()be cold. He came from Brazil, a warm country
A. might
B. can't
C. shouldn't
D. would rather
We ()connect to the Internet yesterday due to a power failure
A. shouldn't
B. couldn't
C. may
D. would rather
Guests ()sign in at the front desk to enter the building
A. can
B. may not
C. must
D. used to