A.write
B.have written
C.was writing 
D.have been writing

A.need
B.should
C.oughtto
D.have   to

A.Should
B.Will
C.Shall
D.Are

A.need    to
B.don’t    need
C.needn’t
D.need

A.it   must   have  rained
B.it   must   rain
C.it   must   be    raining
D.it   must   have   been  raining

A.See
B.To see
C.Saw 
D.Seeing

A.was she doing
B.did  she  do
C.is  she  doing
D.has  she   hone

A.had gone
B.had  set  off
C.had  left
D.had  been  away

A.Ask
B.Asking 
C.Asked
D.To ask

A.are  having
B.have
C.were  having
D.will   had

A.Can it see
B.Can it be seen
C.Can see 
D.Can be seeing it