Yesterday we went to plant trees on the hill near                 
our school. The boys were made dig pits(坑).The               ____________ 
girls were told to plant the young trees into the pits.            ____________
All of us worked very hardly. Soon we were all wet             ____________
with sweat. After the young trees planted, we                  ____________
began to water it. The water was at the foot of                ____________
the hill. But we stood in line to pass pails(桶)                   ____________
of water from one to another up to the hill.                               
We did not finish water the trees until it                         ____________
was dark. Though we were tired,we feel very happy.             ____________