The book was written in 1946, ____ the education system has witnessed great changes.

_____ I finish the book this week—No, you ____ . You ____ return it to me the weekafter next

Bill, what’s your sister’s favorite . –She likesvolleyball best.

How can you expect to learn anything ______ you spend all your time playing computer games?

Do you know sound travels very fast —Yes. But light travels sound.