When you get involved in sports, a lot of racial____are broken down because players developed friendship quickly.
A. barriers B. threats C. approaches D. hardships
--- Jack fell off the ladder yesterday，but he is all right now.
---What a lucky dog! He ________himself badly.
A. should injure B. might injure C. should have injured D. could have injured
It was from only a few supplies that she had bought in the village _____the hostess cooked such a nice dinner.
A. where B. that C. when D. which
Drinking water , having a healthy snack and taking exercise are all positive ways to ____you when you are working on a tight schedule.
A. relieve B. refresh C. liberate D. comfort
We should consider the students’ request ______the school library provide more books on popular science.
A. that 
B. when C. which D. where
He didn’t put the things ____they belonged, for ____he got his punishment.
A. which; that B. what; this C. that; whose D. where; which
