Your natural hair color begins to fade________you grow older, and in time you grow grey[ ]

a teacher, you must observe your behavior, for________ you say and do has a life-long effect on your students

It is said that the terrible illness has killed more than __________ people around the world.

The40-somethings found themselves in an embarrassing situation _____ rapid changesin all aspects of society.

It’s amazing that Bob and Steven________each other so much.— Don’t you know they’re twins?[ ]