He to Dongying many times, so he knows every corner of it.
—What about playing football this afternoon, Sam?—I would rather at home than football. It’s too hot outside.
The cleaners make a great contribution to _____ the city clean.
He is a writer _____ a singer.
She was heard _____ an English song in her home last night.
Not only his parents but also his brother _____ to the Summer Palace. They haven’t been back.