Anyone, whether he is an official or a bus driver, should be     respected.

Do you think shopping online will ______ take the place of shopping in stores?

Chemical pollution will bring about a threat to agriculture and food chain, and ________ to human health.

It is still a problem ______ to hide the stolen money. 

Some people are bad at recalling names and faces, so it's possible that they have a condition called face blindness, ______ people suddenly have trouble recognizing family members, friends or even themselves．