Let’s go and play _____ ping pong. I don’t want to play ____piano.

The road was covered with sand ______ the heavy sandstorm.

________ to the hot weather here was more difficult than I had expected.

From the way the kids spend their money, the researchers can see ________ they really value in life.

Don’t look down upon Bob. He has his own advantages.—Oh, yes. 　　　others are weak, he is strong.