His mother often helps him ___ English so he does better ___ English than others. [ ]

Do you have enough men to carry these chairs? —No. I think we need _______ men.

Tom’s mother often does _____ exercise .

Which one do you want to buy, an iPod touch 4, an iPad 3 or an iPhone 5?—______. They are too expensive.

There is _______ “u” and _______ “s” in the word “use”.