[ TOEIC Grammar and Vocabulary Review ]
Workers ……………. the chemical laboratory must wear masks and protective clothing.
A. enter
B. entered
C. entering
D. enters
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Grammar › ViewThe police already use robots to do jobs that are dangerous ………….…… humans.
A. of
B. for
C. to
D. on
Grammar › View
… sugar you would like in your tea?
A. How
B. How much
C. How many