1 . Chewing gum is a kind of sweet that you can chew for a long time, but when _____, it can be harmful to your health.

A．swallowing	B．swallowed
C．to swallow	D．being swallowed

2 . Into the dark room ______ David, who became surprised then when ______ “Happy Birthday” shouted by his roommates.

A．walked; heard	B．walked; hearing
C．walking; hearing	D．did walk; heard

3 . Even if families are less likely to eat together than ______, millions of Britons still sit down for Christmas dinner.

A．it had been before	B．they had been before
C．the case was once	D．was once the case

4 . Examinees ________ the testing room during exam unless ________.

A．won’t leave; permitted	B．aren’t leaving; being permitted
C．are not to leave; permitted	D．shall not leave; being permitted

5 . Unless otherwise ________, all the regulations apply to students in Senior Three.

A．to be stated

B．stated

C．stating

D．is stated

6 . I hope to see you at the office tomorrow, but if ________, do remember to leave me a message.

A．possible

B．so

C．not

D．any

7 . If you happen to see people at the Starbucks drinking coffee while ________ in typing with hands, don’t think they are office workers. They are so-called “the Atmosphere Group.”

A．absorbed

B．absorbing

C．being absorbed

D．to absorb

8 . These children who don’t have the skills to deal with difficult situations may be at a disadvantage________ with real danger.

A．when facing

B．when being faced

C．when to face

D．when faced

9 . —What do you think of Buckingham Palace?
—Marvelous! Once ______, it can never be forgotten.

A．saw

B．to see

C．seen

D．seeing

10 . One thing you can’t help but________when driving around Australia is the country’s plentiful amounts of space.

A．notice

B．to notice

C．to be noticed

D．being noticed