Why do you often take exercise? — _____ me keep fit.

Today’s young people can’t live without smart phones. They keep their hands on the phones wherever they go, even while they ________ meals.

We don’t know who ____ for the murder, but the policemen will tell us the truth soon.

About _______of the engineers in my company seem to be in their _________．

Mary couldn’t go to the cinema with us because she had to _____ her little brother.