根据句意和首字母补全句子。

1.  The g_______decided to build a new bridge over the river.

2.  The foot s_______could now be heard more clearly.

3.  —What is the p_______of your journey to London?

     —I want to see Buckingham Palace.

4.  He was happy to return home after being an o_______Chinese for many years.

5.  I spent my early childhood in my h_______.

做摩擦片的磨损试验时，加热器和冷却水可以同时打开。