补全对话。
A. Are the trees very important to people?
B. we brought young trees.
C. Did you go to plant trees
D. we used spades to dig holes
E. got water from the river nearby.
A:[[QOrDeR]]last Sunday?
B: Yes, I did. My classmates and I went to plant trees.
A: How did you plant trees?
B: First, we【小题2】in the ground. Then, we【小题3】and put them into the holes.
After that, we【小题4】. We watered the young trees.
A:【小题5】?
B: Yes, they are. They can stop the wind and they can make the air fresh and clean.
A: We should plant more trees.
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