Choose the correct modal auxiliary from the parentheses and write it in the blank.

1		It's possible that it (could / must) rain tomorrow.
2		I don't believe it! It (might not / can't) be five o'clock already!
3		John walks five miles a day. He (must / might) enjoy walking.
4		Ali walks to school. He (couldn't / must not) have enough money to ride the bus.
5		That (couldn't / may not) be Irene! She's out of town.
6		I (couldn't / might not) see you tomorrow.