根据短文内容完成句子

     Look at the picture on the blackboard. We can see a house in it. Behind the house there is a hill with many trees. Near

the hill we can see a river. There are three boats in the river. One is blue, the other two are yellow. There are some Young

Pioneers in those boats. Near the house we can see a big tree. Under the tree there is a small bus. It's a white bus.

1. There is a ________ on the ________.

2. ________ is the hill? It's ________ the house.

3. There are a lot of ________ on the hill.

4. Some ________ ________ are in the boats.

5. Is there a ________ ________ bus under the big tree? Yes, there is.

编制材料消耗定额时，材料提耗率可以通( )计算确定。

A．观察法
B．实验法
C．测定法
D．写实记录法