Our English teacher , having explained to us how to design a project, allowed us  a whole week’s preparation and then ______the class. 
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A
to dismiss
B
dismissed
C
dismissing
D
having dismissed
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 Wait a moment, please. When I _________ writing the letter, I will go shopping with you. 
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A
will have finished
B
have finished
C
will finish
D
finished
 Many accidents________ by careless drivers last year.
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A
are caused
B
were caused
C
have caused
D
will cause
The chairman’s speech ______ the radio when I turned it on.
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A
was broadcast on
B
was being broadcast on
C
was broadcasting in
D
broadcast over