When you are planting trees, the trees ________ straight in the hole.
#36844
A
must put
B
must be put
C
are putting
D
is put
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The mobile phone has influenced people’s life a lot since it .
#39054
A
invents
B
invented
C
is invented
D
was invented
—Why is the classroom so dirty?—Sorry，sir. It yesterday, We forgot to do it.
#39874
A
doesn’t clean
B
didn’t clean
C
isn’t cleaned
D
wasn’t cleaned
He told the policeman that Kate ___________ near the lake at this time yesterday.
#36340
A
plays
B
is playing
C
has played
D
was playing
—Excuse me, where is Mr Brown’s office?—Sorry, I don’t know. I ______ here for only a few days.
#42307
A
work
B
worked
C
have worked
D
will work