—What is your head teacher like? — Oh, he is kind _______ he looks very serious.
A. if B. though C. or
—Which do you prefer, a glass of water or a cup of tea?
—. Thanks. I’m not thirsty.
A．Both B．Either C．Neither
—How many people did you see in the meeting room?
—.
A．Nothing B．No one C．None
—He is late for the meeting.
—
A．So I am. B．So am I. C．So do I.
—What a nice motorbike! How long have you it?
—About half a year.
A．had B．bought C．taken
There are several chemical factories waste water into the river.
A．pour B．pouring C．pours