英语单选题③21.______ their assistance,he would have found himself

英语单选题③
21.______ their assistance,he would have found himself in trouble.
A.A.No
B.B.None
C.C.Not
D.D.Without
22.Their dialogue was so funny that we all _____ laughter.
A.A.broke into
B.B.broke away from
C.C.broke out
D.D.broke down
23.They could do ______ wait for the doctor to arrive.
A.A.anything except
B.B.anything but
C.C.nothing but
D.D.something but
24.The doctor _____ up his hat and coat after he came into the room.
A.A.hanged
B.B.hung
C.C.hanging
D.D.hunging
25.Though it may be difficult,one must always try to _____ to the promises he or she makes.
A.A.stick
B.B.stuck
C.C.strike
D.D.strict
26.Mary ______ an overcoat,but she chose to lend the money to a needy friend.
A.A.could buy
B.B.can buy
C.C.could have bought
D.D.must have bought
27.Alice looked pale yesterday.I suppose she _______ill.
A.A.must be
B.B.must have been
C.C.can be
D.D.can have been
28.They went on ______on the plantation though it was getting dark.
A.A.to work
B.B.to working
C.C.work
D.D.working
29.The room was empty______ a bench or two.
A.A.except
B.B.but
C.C.except for
D.D.but for
30.A single worker can hold_____ an entire assembly line if he fails to keep up with the work flow.
A.A.down
B.B.out
C.C.in
D.D.up

d
a
c
b
a
c
b
d
a
d