Success in life doesn’t happen ______. It’s the result of devoting your time and energy to what you’ve set out to do.

We’ve spent too much money recently.—Well，it isn’t surprisingOur friends and relatives ______ around all the time

She says that she’ll have to close the shop ________business improves

I called you last night, but nobody answered— Oh, I usually__________off my cell phone by 8:00 pm

He will go to school by bike ___ on foot