She first _____ singing and dancing, but soon lostinterest and became a businesswoman.

y after the book Uncle Tom’sCabin________, the Civil War of America________.

Changing the design of a new product may ____ the riskof its production in the market．

Is it time_______ supper- Yes. It’s time for us_______ have supper.

________a teacher has given permission is a student allowed to enter the classroom.