I just don’t understand_______ that prevents so many Americans from being as happy as one might expect.

4. The huge picture looks more beautiful_____ the blue sky.

Excuse me , haven’t you learned the new ___law Everyone in a car must wear the seat belt.—Sorry , we won’t do that again.

Have you heard that the pop star was charged with taking illegal drugs? — It’s difficult for a fun like me to accept that _________

“You can’t judge a book by its cover，”________．