Ответ:
1) My aunt is full of beans today. She must be excited about something.
2) Jake was cool as a cucumber when his canoe turned over in the river. What a brave man!
3) My roommate is such a couch potato. Last weekend he watched television for 14 hours straight!
4) There is no use crying over spilt milk and we should not worry about what happened in the past.
5) There were four people trying to fix the broken air conditioner but too many cooks spoil the broth and there were too many people to do a good job.