_______ do you talk to your teacher at the School Air—Once a week.

Actually not all ads play tricks on customers.—_____. PSAs serve the public.

1． He moved here a week ago. So he has ______ goodfriends in this city.

The heavy fog in London made _________deep impression on us, which was sometimes so heavy that we lost _________sight of everything around us.

ess can be extremely harmful to your health. Exercise, ______, can reduce its bad effects.— I can’t agree more.