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Age. Fill in the blanks.

Wiek. Wstaw słowa w wolne miejsca w zdaniach.
elderly as old as mature immature young
1. Peter is young yet he acts in a very   way.
2. I can't believe you did it. It was irresponsible and   .
3. When on a bus always offer a seat to an   lady or a gentleman.
4. I'm   you are. We are at the same age.
5. I'm sorry you are look too   to buy a beer. May I see your ID or a proof of age?