Do you often____your pen pal-Yes, quite often. We often talk about our school lives in the letters.

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

How do you learn English, Toby —I often practice English _____ talking _____ my American friends.

_______ impressed me was the boy’s ability to dealwith this kind of difficult physics problem

_____the teacher couldn’t understand was _____ fewer and fewer students showed interest in his class.