补全对话。（5%）
A: last Sunday?
B: Yes, I did. My classmates and I went to plant trees.
A: How did you plant trees?
B: First, we in the ground. Then, we
and put them into the holes.
After that, we . We watered the young trees.
A: ?
B: Yes, they are. They can stop the wind and they can make the air fresh and clean.
A: We should plant more trees.
当你看到黄灯亮时，你可以对同学说：
A.Red is stop.
B.Yellow is wait.
C.Yellow is go.
当你给别人指路，想告诉他向左转，你应说：
A.Turn left.
B.Turn right.
C.Go straight.
当你想告诉同学李明在学校，你可以说：
A.Li Ming is in front of the school.
B.Li Ming is inside the school.
C.Li Ming is outside the school.
当你邀请别人一块去打乒乓球时，你应说：
A.I want to play ping-pong.
B.Let’s play ping-pong.
C.You can play ping-pong.
_______ is the animal on the farm.
A. Elephant B. Kangaroo C. Cow