1．I thought the actor was famous, _________ none of my friends has ever heard of him.
A. and B. or C. so D. but
2．________ I got back, I found my mother cooking for me.
A. When B. Before C. Since D.Although
3．You will be late for school________ you don’t get up early.
A. but B. if C. and D. or
4．Think it over, _____ you’ll work out the math problem.
A. or B. so C. for D. and
