People will three days a week in the future．
A：to work
B：work
C：working
D：works
—I don't know which skirt was ______, so I took them both.—Yes, it's really difficult to choose.
文中引用徐霞客赞美黄山的名句：“五岳归来不看山， 。”其中“五岳”是指东岳（ ），南岳（ ），西岳（ ），北岳（ ），中岳（ ）。
3平方千米=____公顷
