英语翻译The key to choosing a major is to see how relevant it is

How ( )it is to see you again is there a key to the door 英语翻译How to behave wellbehaving well is the key to grtting on Knowledge is atresure,but practice is the key to it . the key ring _ Millie.It's _.A.is belong to,hers B.is belong Knowledge is a treasure ,but practice is the key to it 翻译成中文 Is it the key to the door of for classroom how to translate the sentence:"to see is to believe" 英语翻译Choosing what to eat is no longer as easy as it once was Is it (fun ) to see a monkey riding the bicycle? Knowledge is a treature ,but practice is the key to a key to the door//to可以换成is吗?