11.I don't know ____.
A.why do this
B.why to do this
C.why doing this
D.why we ought to do this
12.The man over there is ____ our principal.
A.no other but
B.no other than
C.no one than
D.none other than
13.No one can walk the wire without a bit of fear unless ____ very young.
A.having been trained
B.trained
C.to be trained
D.being trained
14.-- When can we come to visit you?
-- Any time you feel ____.
A.for it
B.to it
C.like it
D.so
15.His honesty is ____: nobody can doubt it.
A.in question
B.out of the question
C.beside the question
D.without question
16.You won't get a loan _______ you can offer some security.
A.lest
B.in case
C.unless
D.other than
17.______ time, he'll make a first-class tennis player.
A.Having
B.Given
C.Giving
D.had
18.I _____ the party much if there hadn't been quite such a crowd of people there.
A.would enjoy
B.will have enjoyed
C.would have enjoyed
D.will be enjoying
19.This company has now introduced a policy ____ pay rises are related to performances at work.
A.which
B.where
C.whether
D.what
20.He wasn't asked to take on the chairmanship of the society, _______ insufficiently popular with all members.
A.having considered
B.was considered
C.was being considered
D.being considered