请根据句意或括号中的中文提示、英文释义，写出句中所缺单词， 使句子通顺。

1. ______ (安全) is the most important thing while we are crossing the street.

2. Yuan Longping is called "Father" of Hybrid rice, and his achievements go ______ (超出) China.

3. I've lost my watch, but it must be ______(in a place, but you do not know exactly where) in the house.

4. We were reading the passage aloud when the English teacher ______(go or come into) our classroom.

5. France is a European country, while China is an _______country.

屋顶无土种植式和屋顶覆土种植式没有以下哪种优势（）

A.减轻了屋顶荷载

B.大大提高了屋顶的保温隔热效果

C.降低了能源的消耗

D.更加经济