1. check into a/the hotel 在旅馆或酒店办理登记手续

=check in (at a/the hotel)

We will check into a hotel as soon as we get to Taichung.

我们一抵达台中就会去旅馆办理住宿手续

Let's check in before we have lunch at the hotel.

我们先在旅馆办理住宿手续再去吃饭吧

2. check out (of a/the hotel) 办理退房手续

If you check out after 12 noon, you'll have to pay for another day.

如果你中午12点之后才退房，就要多付一天的钱

3. fill out=fill in 填写（表格、文件...）

Before the job interview, you have to fill out an application form.

在工作面试前，你必须先填申请表

4. pay by cash 付现金

by charge=by credit card 刷卡

I always pay for things by cash.

我买东西向来是付现金

It's easy to overspend when you have a credit card.

当你有信用卡时就很容易花钱过度

charge还可作动词表示收费、要价

charge+人+钱+for+物

The tutor charges his student $10 an hour for english lessons.

那个家教教一小时英语课向学生收费10美元

5. luggage=baggage 行李，不可数

其他类似的词：

bag 袋子，包

handbag 手提包

box 箱子

suitcase 手提箱

briefcase 公文包