6. Guess the meaning of the following idioms, then fill in

6. Guess the meaning of the following idioms, then fill in the gaps in the sentences below.
As thick as thieves crime doesnt pay daylight robbery set a thief to catch a thief
1. The police tracked down the killer with the help of a convicted murder as the saying goes, . .
2. They charged me 40 pounds for that terrible meal! Thats ..!
3. Keith and Jack are . ; they spend all their free time together
4. You shouldnt even think of stealing money from the company; you should know that