1）
____ a meal for about 50 guest, start by calculating how much food you want to prepare per guest.
答案是To prepare 而我选了preparing
，想请教一下，这不是分词构句的概念吗？还有，可以把To prepare这句移到per guest 后面吗？
2）___ of the employees who prefer to travel by train will not be able to arrive in time for the opening ceremony.
答案是Most，而我选了One（我也考虑国most....）
One 解释起来也通啊～
感谢大家指教～