1. pride oneself in / on ?
看到有老師教要用in 還有下面這句
Maria prides herself in her culinary ability and hopes to win the cook-off.
所以 in / on 都可以嗎? 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當程序解釋時 是可數名詞
所以這裡是不是少了 冠詞或 s