根据句意和所给首字母补全单词

1.His father is an e_____,and he designs ( 设计) a lot of bridges.

2.The Chinese g_____didn't want a foreigner for a Chinese railroad.

3.It was difficult to build the railroad because there were a lot of bridges and t_____.

4.Mr. Smith is the h_____of Mrs. Smith.

5.Yang Liwei is a great a_____in China.