按要求完成下列句子。
1. The students should wear their uniforms at school. (改为同义句)
The students are _____ _____ wear their uniforms at school.
2. His father went out and didn't say a word. (改为同义句)
His father went out _____ _____ a word.
3. Wei Hua has learned two kinds of foreign languages by herself. (改为同义句)
Wei Hua has _____ _____ two kinds of foreign languages.
4. Yesterday he received Tom's e-mail. (就划线部分提问)
_____ did he _____ e-mail?
5. You are supposed to bow in Korea. (改为否定句)
You _____ _____ to bow in Korea.