Good Riddles

Riddle #552 (medium)

Question: What's made of wood but can't be sawed?

Question: Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

Riddle #359 (medium)

Question: I have more shoes than anybody,
but less feet than everyone.
I am met in the morning,
but departed in the night.
I may shake as if I'm angry,
but I won't bite.

What am I?

Riddle #362 (medium)

Question: I open to close but I close to open.
I'm surrounded by water but I'm never soaking.

What am I?

Question: You have a flashlight that takes 2 working batteries. You have 8 batteries but only 4 of them work.

What is the fewest number of pairs you need to test to guarantee you can get the flashlight on?