A: Alice, please tell Eric to call me when he _________ back. B: No problem. 
#41713
A
come
B
comes
C
came
D
will come
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– 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
   ---     Bob doing homework?---No, he isn’t. He is        a letter.
#41826
A
Does, writes
B
Is, writes
C
Does, writing
D
Is, writing
We’ll go to the park unless it ____tomorrow.     
#38365
A
rains
B
willrain
C
rainy
D
isgoingtorain