1. It is about Tom's worries on his height and changes in teenagers' body and mind.
2. It is about Tom's worries about his height and changes in teenagers' body and mind.
3. It is about Tom's worries on his height and changes in teenagers' bodies and minds.
4. It is about Tom's worries about his height and changes in teenagers' bodies and minds.
(It refers to 'the reading text.' Which ones are grammatical?)
5. It is pain frm growing quickly as a teenager.
6. It is pain from growing quickly when a person is a teenager.
7. It is pain a teenager get by growing quickly.
(It refers growing pain. Are the three sentences the same? Would you let me knwo correct expressions? Do you have similar expressions to this expression?)
Thank you for your help. I reposted.
1. The reading assignment is about Tom's worries regarding his height and changes in teenagers' bodies and minds.
I've reworded this.
6. It is pain from growing quickly when a person is a teenager.
This one is the best of the three.