______ do you keep fit—I often run ______ keep fit.

____________ you give me a hand The box is too heavy. — No problem.

Considering the foggy weather, we can’t _____the possibility of the train coming late again.[ ]

Do you know the reason ________ pilots turn off the plane’s lights before taking off?— The practice is for the passengers to adjust to the dark ________ an emergency[ ]

Oh，it’s you，Jane！I didn’t ___ you. Where have you been these years