How time flies ! Several years _____ since we last met at Jack’s Party.
#39388
A
has passed
B
had passed
C
have passed
D
will pass
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Listen! Someone _____ songs.
#41840
A
are singing
B
singing
C
sing
D
is singing
---Is that Jack speaking?  ---Sorry, he _______ in. He _______ back in half an hour.      
#41814
A
isn’t; will be
B
wasn’t; will
C
isn’t; is
D
wasn’t; was
– Look at these factories. I hate them. They____ many rivers here. --Yes. Something ______ to stop the pollution.
#39701
A
polluted, must do
B
had polluted , must be doing
C
have polluted , must be done
D
were polluting, must be done