---What’s wrong with you ? You look so tired.--- Last night I ________ sleep well.A. couldn’t B. can’t C. wouldn’t
I don’t remember _______ the book yesterday.
_______ useful information it is!
She is a _______ girl and she always says to her teachers _______.
The math problem is _______ hard for me ______ work out.
----How do you learn English, Toby? ---I often practice English _____ talking _____ my American friends.