1.no date has been fixed ＿＿their visit____China.
A.for,to B./,to C.for,/ D.at,for
2.his father made a living_____teaching.
A.with B.br C.on D.in
3.The castle dates______the fourteenth century.
A.from B.back to C.back D.AorB
4.He trades_____wood and cotton__a firm in Norway.
A.in,with B./,with C.with,in D.in,to
5.She is waiting_____her chair_____Mary.
A.for,in B.in,for C.for,for D.for,on
选出正确答案,要解释为什么.并翻译句子.