A bunk bed

None, they were wearing boots.

BECAUSE THE WINDOW IS CLOSED!

2 (Two) + 8 (Eight) + 9 (Nine) = TEN (10)

Spelling.

Grapes

Mount Rushmore

the man is the son of the man who is speaking

One thousand is the first number that, when spelled out, contains an a. (One hundred and one if you count the "and.")

The letter “n”.

Cat ~ see aye tee

In number base 4.
22 = 10