It is requested that each of the teachers invited ______ a performance at the party. 
#86930
A
give
B
will give
C
has to give
D
must give
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 If he ___ that he ____ to work there, everything would be OK now.
#89504
A
insisted, be sent
B
insisted, was sent
C
had insisted, be sent
D
had insisted, was sent
What a pity! Considering his ability and experience,he___ better.
#87930
A
need have done
B
must have done
C
can have done
D
might have done