—May I come in? I’m sorry I’m late. —Come in, please. But could you tell me ?
He had to retire(退休) early ______ poor health.
One of the most interesting places in Yangzhou ________ are often visited by foreigners is the West Slender Lake.
—I can’t find Mary. Where’s she? —Sorry, I don’t know ______.
—Is the film interesting? —I thought it would be. But ______, it’s very boring.
—______ did you sleep last night? —Only five hours. I stayed up late to do my homework.