e past decades, sea ice in the Arctic as aresult of global warming

What do you think of the report about the airpollution on TV last night?—I think the situation is so thatwe should take action to protect the environment.A．serious

You had better__________because you have todrive back home.

Could you tell me ____________ a meeting in Guangzhou next week

There was a smile on the coach’s face. He was very ______ with his players.