A lot of trees ______ on the hill yesterday.
#44945
A
are planted
B
will be planted
C
have been planted
D
were planted
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—Oh, this is really an old building.—Do you know when it        ?
#44645
A
has built
B
is built
C
was built
D
will be built
People should __________ from __________ down the trees to protect the earth.
#44463
A
be stopped, to cut
B
stop, to cut
C
be stopped, cutting
D
stop, cutting
While he            the bus, he             a book.
#44868
A
was waiting for, read
B
waited for, was reading
C
was waiting for, was reading
D
waited for, read