Nowadays, many people walk to work ____Copenhagen Conference calling for living a low-carbon lifestyle to cope with global warming.
Over the past decades, sea ice_______ in the Arctic as a result of global warming.
Our teacher suggests English every day to improve our spoken English.
— How about Thursday morning? Say, 10 o’clock? — OK. I’ll be expecting you then.
His sister left home in 1998, and_______ since.
— I went to see a film yesterday. — Oh, did you? .