Yesterday we went to plant trees on the hill near                 

our school. The boys were made dig pits(坑).The               小题1:____________ 

girls were told to plant the young trees into the pits.            小题2:____________

All of us worked very hardly. Soon we were all wet             小题3:____________

with sweat. After the young trees planted, we                  小题4:____________

began to water it. The water was at the foot of                小题5:____________

the hill. But we stood in line to pass pails(桶)                   小题6:____________

of water from one to another up to the hill.                               

We did not finish water the trees until it                         小题7:____________

was dark. Though we were tired,we feel very happy.             小题8:____________

期货交易采用的结算方式为（）。

A.当日无负债结算

B.一次性结清

C.货到付款

D.分期付款