Tom arrived__________schoolat 7:00in the morning.
A. for
B. on
C. the
D. at
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Itis __________ for people to work at home
A. harmful
B. serious
C. possible
D. difficult
Weare delighted at the news __________they have told us.
A. that
B. when
C. with
D. what
It is __________ to learn online
A. convenient
B. harm
C. red
D. live
It is Tom__________finisheddoing his own homework.
A. that
B. who
C. whose
D. whom