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          you read it , you can' t imagine how moving the story is .
A. Unless         B. Because          C. Although

—We can’t be successful ________ we keep working hard.
—I agree with you.      

Jack spends much money on books ________ he is not so rich.

The thing that matters is not whether you fail or not, ________ whether you try or not.

--- When did your father come back last night?
--- He didn’t come back _______ he finished all the work.                                                           

I was doing my homework _______ mother was cooking.

—It’s too late. I have to go now.
—Oh, it’s raining outside. Don’t leave _______it stops.
A．since B．until  C．while

Kate's dad is getting old. She will go back home to see him _____it is convenient.

Learning to write is learning to think. You don’t know things clearly _______ you can write them down.

I thought the actor was famous, _________ none of my friends has ever heard of him.