We open the window.... fresh air could blow into the room.
A.for
B.so that
C.not only
D.because

....you play the piano? - Of course, yes.
A.Can
B.Must
C.Should
D.Need

The machine.... be turned on by pressing this button.
A.might
B.ought to
C.should
D.can

....you hold your breath for more than a minute? - Of course not.
A.Needn’t
B.Would
C.Might
D.Can

Let’s ask our teacher how to solve this problem.... we can’t agree on the answer.
A.so
B.though
C.for
D.since

John thought he had a good chance to get the job, .... his father was the manager’s friend.
A.since
B.though
C.as
D.for

Do it.... you want.
A. as
B.so
C.so that
D.for

The country is famous for the beauty of its landscape.... the hospitality of its people.
A.thus
B.since
C.otherwise
D.and

Did you go out.... stay at home?
A.and
B.or
C.as
D.so that

They tried hard.... did not succeed.
A.but
B.so
C.while
D.whereas