Cruise fare ??

我想問 :

increase over , 為什麼加了over,
increase over the Chinese New Year period
其實上面over不跟increase,over 是和the Chinese New Year period.一齊解:在新年期間.
will increase over the Chinese New Year period = 將會在新年期間增加

We wonder 是否解好奇的問,..
wonder 解:想知道 - wish to know (about something)

put down 是否解留下..
put down解:放低,留下.

wonder how much deposit we need to put down = 想知道我們需要放低多少訂金

Whether 是否解是否 ..
whether 是解: 是否 - if, or not
whether there would be any discount fare for a group of 50 people = if there would be any discount fare for a group of 50 people or not

001已經答得很好。

唯有put down這裏是日常口語，意思是如中文廣東口語「放低」錢。轉為白話或正式翻譯應該是「該付」多少錢」。