根据下面句子的意思及所给的首字母或英汉提示，写出空缺处单词或词组的正确形式。

1. Li Bai and Du Fu were great p___________ in ancient China.

2. How about ___________ (fly) to Kunming? I think it's far more enjoyable.

3. Tom is much ___________ (careful) than Li Lei.

4. I hope I can talk with Yao Ming ___________ (面对面) one day.

5. He was so hungry that he ___________ (吃光) all the food in the dish.