Answer:
What is shaped like a box, has no feet, and runs up and down?
Four leaves I have.
I am a mountain at night, meadow at day. What am I?
Physicists have built devices to move me very fast. My last seven letters can be commonly found in newspapers magazines and journals.
I am a creature with a βtightβ name.
A little house full of meat, no door to go in and eat.