—You are always full of_________ . Can you tell me the secret?—Taking enough exercise every day.

“中华人民共和国”的缩略词是______.

—Excuse me, what’s the_________usually used for? --It’s used for protecting people from the rain. 

The dolphins are ______ interesting in the zoo.

—What has ________ done since 1989?. —It has built many schools for poor children .