Wed better wait till December Bill （） his exam by then，so hell be able to enjoy himself.

A good deal of research is being carried out nowadays （） the cause of juvenile crime.It is obvious that one of these is an unsatisfactory home background.

A.about
B.on
C.into
D.over

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I should like to （）to the theater with you yesterday，but I didnt have time.

A.go
B.have
C.going
D.be

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