The driver （后悔） his carelessness in diving and went to the hospital to say sorry to his passengers．
People all over the country feel proud that all China's spacecraft have （成功地） returned to the earth．
Last weekend， at the welcome party， the host （介绍） the history and culture of Taizhou to the guests．
Shared bikes can help people travel around freely in cities without （污染）．
Can we put another bed in this room？
Sure． It is big for a third one．