11.When she returned,her daughter _____ the floor.
A.was sweeping
B.had swept
C.is sweeping
D.have swept
12.While Mary was walking down the street,her purse _____ by a young man.
A.is snatched
B.was being snatched
C.was lost
D.was snatched
13.One of the machines stopped _____ and caused a blockage in the assembly line.
A.to work
B.working
C.worked
D.to be working
14.It's foolish of me to have told him that.I ____ him that.
A.needn't tell
B.shouldn't tell
C.mustn't tell
D.shouldn't have told
15."Is the radio bothering you?" "It certainly is.I'd like it _____off."
A.turning
B.to turn
C.turned
D.was turned
16.If she understood the rule,she ______ these mistakes.
A.will not make
B.would not make
C.would not have made
D.did not make
17.Although he didn’t like most sports,he enjoys _____.
A.to swim and golf
B.swin and golf
C.swimming and golfing
D.swimming and golf
18.If a thing is worth ______ ,it’s worth ______ well.
A.to do … doing
B.doing … to do
C.to do … to do
D.doing … doing
19.______ ,we missed our plane.
A.the train is late
B.The train being late
C.The train be late
D.The train’s being late
20.The judge ordered that the man ______.
A.will be released
B.was released
C.be released
D.has been released