The mobile phone has influenced people's life a lot since it __________.
#36751
A
invents
B
invented
C
is invented
D
was invented
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 ---________ he still _________ in his office? ---No. He __________ back home. 
#37613
A
Is; working; went
B
Has; worked; is going
C
Is; working; has gone
D
Did; work; is going
I am a teacher and I _____ in this school for 5 years.
#40421
A
teach
B
taught
C
will teach
D
have taught
I don’t know ______ tomorrow.
#38277
A
where my father will go
B
where will my father go
C
where did my father go
D
where my father went