Choose the most appropriate word

A sliding door that lets air in, but keeps bugs out: A ... door.
1. net
2. screen
A couch that also functions as a bed: A ... bed.
1. sofa
2. king-size
This prevents the bathroom from getting wet when you take a shower: A shower ... .
1. cap
2. curtain
A closet which is big enough for you to walk inside to get clothes, etc.: A ... closet.
1. walkable
2. walk-in
A flight of stairs leading to the second floor: A ... .
1. staircase
2. stairs
An appliance that cools your house in the summer: An air ... .
1. cooler
2. conditioner
You use this to open a door: A door ... .
1. knob or handle
2. hand or handle
You hang this on a wall to know what time it is: A ... .
1. clock
2. watch
We don't have a TV ... , so we put our TV on top of a milk crate. ( = plastic containers used to transport milk)
1. shelf
2. stand
Most people keep their books on a bookshelf, also known as a ... .
1. book-closet
2. bookcase