It’s difficult for me to decide which one to choose, because ______ of them are good. 

——Which of the two English dictionaries will you buy?——I’ll buy ________ of them, so I can give one to my friend Helen.

Is there ________ wrong with your TV?

—     of shoes do you wear?—Size 8.

_______ boys in my class can ski but _______ of them can do as well as Jim does.