We must protect plants. They are friends of ______.

Do you know that China is one of_________countries in the world—Yes, I do. It’s much________than the U.S

ed with his sister, Jerry is even more ________to, and more easily troubled by, emotional and relationship problems

Our world ___________ to live in without somuch pollution．

Bob, are you free at the moment I have to ask you some questions.–______