To file to keep papers, documents etc in a particular place so that you can find them easily:  
- The contracts are filed alphabetically.

Dozen

1. twelve:   

- a dozen eggs

two/three/four etc dozen (=24, 36, 48 etc)

2. informal a lot of

-   I've heard this story a dozen times before.

In touch (with somebody) talking or writing to someone:  

- We'll get in touch (=start talking or writing to you) as soon as we know the results of the test.

Cab (n) a taxi:

- New York's yellow cabs

take/get a cab

- I took a cab to the airport.

Costume (n)  = swimsuit = bathing costume a piece of clothing worn for swimming

Block (n) a large building containing many apartments 

To contact to write to or telephone someone:  

- Give the names of two people who can be contacted in an emergency.

- Please do not hesitate to contact me if you have any queries.

How much / many

How much longer

How soon

How

How long

How often

How late

How far 

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