1. pride oneself in / on ?
看到有老师教要用in 还有下面这句
Maria prides herself in her culinary ability and hopes to win the cook-off.
所以 in / on 都可以吗? 以前只知道一定要用on
2. Following protocol, they diverted to Winnipeg and began to descend.
查字典 protocol当程序解释时 是可数名词
所以这里是不是少了 冠词或 s