---What’s wrong with you, Jack? You look tired.---I ________ to prepare for the final exam last night.
I used to ______ late, but now, I’m used to _____ early
I’ll never forget the days ______ we spent together.
The girl was often heard _______ happily in her room.
The tall boy ______ be Mike. He has gone to New York to study.
The old men in hospital __________.