On Jan 1st,you can say 元旦快乐. Jan 1st----元旦always in this day,but the date of "新年"New Year is changeable .

Although someone think that it is difficult to learn mandarin, i will say interest is important. During your free time, listen songs and see movies,it is benificial to enjoy chinese learing. Obviously,Pronunciation,grammer and vocabulary are the key to learning mandarin.

(....的时候de shi hou ) is similar to "when" For example: (1)when i think something seriously ,i am unhappy to be disturbed. 当我认真思考的时候，我不高兴被打扰 (2)when we have interviews,we will be a little nervous 当我们要参加面试的时候，我们会有点紧张 (3)when we will have business travel ,we should do some prepartions ahead of time,such as booking tickets,hotels and so on. 当我们要商务旅行时，我们应该提前做准备，比如订机票，酒店，还要其他。

i think both are ok. But in formal situations "xi sho jian 洗手间" is better.

厨房：It means "kitchen" where we can cook at home 食堂：It is used for us to eat,especially in schools,factories,companies....It severs for a great number of people. 餐厅：It means those places can offer many kinds of food to customers,such as restaurants.

一朝被蛇咬，十年怕井绳 　　 拼音：yī zhāo bèi shé yǎo，shí nián pà jǐng shéng 　　 解释:喻指经历过一次挫折以后就变得胆小怕事。 　　 “井绳”就是水井轱辘上的绳子。引伸义:就是一旦受过伤害就对类似的东西或事件非常惧怕，古有“绳蛇”的比喻。 Yeah,in my opinion, the meaning is similar to "once bitten,twice shy"