--You don't look so well, Mary. What's the matter with you?--Why?___________.
It was when she was about to go to bed ______the telephone rang.
When _____ to hand in his homework, Philip told his teacher that he had left it home.
It was ______ that I didn’t like to leave my room.
In his new book, the writer _______ his memories of village life.
I’d appreciate ______if you would give me some advice on English learning.