几道英语题目!要说明原因啊1.It was so late,___the farmers went to workong

几道英语题目!要说明原因啊
1.It was so late,___the farmers went to workong in the field. A.and B.or C.so D.but 2.It's very nice____you to give me the chance. A.of B.for C.to D.at 3.The river through our city,which is about___,is clean again A.6000 meters long B.6000-metres-long C.6000-metre-long
D.6000 metre long 4.Thet said they would have___holiday? A.a two-month B.two months C.two-months D.two month's