She had to have the operation or she.... .
A.dies
B.will die
C.would die
D.would have died

.... to the music after 10 pm, you should turn the volume down or use an earphone.
A.If you are listening
B.Unless you listen
C.Provided you won’t listen
D.Otherwise you listen

.... , tell him I have gone to London.
A.If Mr. Jones called
B.Unless Mr. Jones calls
C.Should Mr. Jones call
D.If Mr. Jones will call

Practice more and more.... you can never speak English fluently.
A.and
B.or
C.in case
D.if

…. , they would not have had such a successful conference
A.Due to good preparations
B.But for they had had good
C.Without good preparations
D.If their good preparations

Call your parents…. they will start to worry.
A.if only
B.otherwise
C.if so
D.in case

If it.... for the life jacket, I would have drowned.
A.is not
B.was not
C.has not been
D.had not been

.... heavy traffic, we would not have been late for the train.
A.If
B.If only
C.Supposed
D.But for

.... the boat leaves on time, we will arrive in Paris by the morning.
A.If only
B.Provided that
C.But for
D.Without

Try harder.... you will lose everything you have.
A.provided that
B.supposing that
C.if
D.unless