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

Lingling, do you know ___________ woman in white—Yes, she is __________ nurse in Children’s Hospital.

Could you help me put up the maps on the wall—-_______.

18．On October 31st, known as Halloween, dozens of children ________ costumes knock at their neighbor’s doors and yell “Trick or Treat” when the door ________.

Clean water and fresh air are essential for our daily life, _______ we can’t live.