--        classes do you have this afternoon ?    –Three. 

— Is everything ready for the party ? — I hope there are enough glasses for each guest to have _____

The math problem is _____ difficult that only _____ students can work it out.

 — Is this book yours? —No, it’s not ______. It’s Betty’s.

– _____ do you think of studying abroad, Lingling?– Well, it all depends! I prefer studying at home.