What do you think of the terrorist attack in Xinjiang—Terrible. It has changed people’s daily life ________.

Do you know second-hand smoke— To protect our health and memory.

My best friend’s in a bad mood.— How about ________ her some flowers?[ ]

It’s late now, but I still have homework to do.

It is safe to eat chicken that________fully, but most people still dare not do that because of the H7N9bird flu .