根据句意及汉语提示，完成句子或对话。

1. Autumn is coming, the _____ (叶子) turn yellow.

2. Mary's grandfather is watering the flowers in the _____ (花园).

3. Who is the young man ____ (等候) at the bus stop now?

4. Pandas are ____ (有几分) shy, so please be quiet.

5. —What _____ (语言) can your father speak?

    —French and English.

砂浆强度等级是用边长为（）的立方体标准试块，在温度为15~25℃环境下硬化，龄期为28D、的极限抗压强度平均值确定的。

A、70mm

B、100mm

C、70.7mm

D、75mm