find a mistake in this sentence

[Yashen'ka]

Could you help me to find grammar mistkes in these sentences?
1. Who's smoked? Can't you read? There's a 'No Smoking' sing in here.
2. Our cat has been missed since 5 days.
Thank you)))

[Beeesneees]

1. Who has been smoking? Can't you read? There's a 'No Smoking' sign in here.
2. Our cat has been missing for five days.
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Cheers m' dears!