补全对话
A:Look!_____are some boats over therer in the lake.
B:_______ _______are there?
A:Let me count.Oh there ______ five.
B:Look,there_____ some children in the boats.
A:How many boys _____ _____?
B:I think there are six.
A:_______ ________ ________ girls?
B:Yes,there are four.