---How long does it take us to go to Mount Qingcheng?---It takes us hour or more to go to Mount Qingcheng by subwayA.an;a B.a;an C.an;/
—Was Tom a little ill yesterday? —_______.
—Do you know where the twins are? —Yes. They _______ Fuzhou.
It’s raining heavily now. You’d better _______home.
— ____________we swim in that river? —No, you _______. It’s dangerous to swim there.
—Would you please tell me something about your travel in Sydney —____________.