I said I'd go, just to keep him happy.

　　我說(shuō)過(guò)我要去只是為了讓他高興。

　　I'm sure she's keeping something back from us.

　　我肯定她有什么事瞞著(zhù)我們。

　　Some teachers find it difficult to keep their classes in order.

　　有些教師覺(jué)得難以維持課堂秩序。

　　Keep down! You mustn't let anyone see you.

　　蹲下！一定不要讓人看見(jiàn)你。

　　I keep thinking back to the day I arrived here.

　　我不斷回想起剛到這兒那一天的情景。