Great changes have taken place in China since the People’s Republic of China in 1949.
I missed the last bus, so I _____ go home on foot.
I got up early that morning, but I _____ so because I had no work to do.
You must be a writer, _____?
She’s already two hours late. What ______ to her?
— Will your brother stay home tonight?— I’m not quite sure. He _____ to the cinema tonight.