deranged : The stranger looks mentally deranged.  ✔

​

overhear : It is annoying to overhear someone's personal conversation in a subway.  ✔

​

contentment : She couldn't express her contentment even if she won the poker game. ✔

​

inhibited : I was inhibited from calling my boyfriend because my parents was sitting just next to me 

=> inhibited : I was inhibited from calling my boyfriend because my parents were sitting just next to me. ​

abuse : Most problem caused by smartphones is due to abuse of smartphones. ✔​

yak : Don't yak when your mom looks angry.  ✔​

oblivious : I was totally oblivious of my mistakes which makes my boss annoying. ✔​

advent : Thanks to advent of internet people from all over the world can be connected anytime.  ​

=> advent : Thanks to the advent of the internet people from all over the world can be connected anytime.  ​

The meeting will be held on 2nd floor.  

=>  The meeting will be held on the 2nd floor.  ​

The meeting is from 9am to 11am.   ✔​

Mr. Kim will lead the meeting.   ✔

​• Corrected: The sentences are corrected grammatically.​​