He is speaking English, but I think he.... be Vietnamese, by judging by his accent.
A.will
B.could
C.would
D.should

Listen, please. You.... talk during this exam.
A.won’t
B.mustn’t
C.wouldn’t
D.coudn't

I.... go on my own. You.... go with me.
A.will / mustn’t
B.should / would not
C.could / will not
D.can / needn’t

The police searched the region carefully.... they found nothing.
A.whereas
B.nor
C.but
D.as if

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