When the teacher ______ how to do the experiment, the bell rang.
#37863
A
explains
B
will explain
C
was explaining
D
is explaining
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— Tommy, do you know if Frank ______ to the zoo this Sunday if it _______?— Sorry, I have no idea. 
#41968
A
will go; is fine
B
goes; is fine
C
will go; is going to be fine
D
goes; will be fine
A new school building _____ in Zhuyuan Middle School in next year.
#38781
A
will be built
B
is built
C
will built
D
buil
. You had better take enough money with _________ while you ___________.
#38500
A
yourself, were shopping
B
yourself, are shopping
C
you, are shopping
D
you, were shopping