Burn the midnight

oilTo work late into the night

Can't judge a book by its cover

Cannot judge something on appearance

Caught between

two stoolsDifficult to choose between two

Cry over spilt milk

When you complain about a loss from the past

Once in a blue moon

Happens very rarely

See eye to eye

Two (or more people) agree on something

Every cloud has a silver lining

Be optimistic

Not playing with a full

deckSomeone who lacks intelligence