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Can someone help me with these? The bold is what I think.

1 Its so silent in the morning that the slightest noise can be heard. OK
2 He was there for me when no one else was. OK
3 I got a head start on/with my homework at school. Don't know
4 I hadn"t had hair this short in a while. OK
5 Let the shirt air out for a couple of days so it doesn't stink as much at the/on the armpits if you don' want to wash it. I don't know if you can air out.
6 It's thanks to our government that us kids only have school 4 days a week. OK
7 I was doing my homework in bed and fell asleep to/on my notebooks. BOTH
8 You're the only person in the family I can laugh with and be myself with. OK
9 When she walks me to school she walks so fast I find myself 5 yards behind her all the time. OK
10 It seems like she's willing to give it a 2nd chance. OK

thank you
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1 It's so silent in the morning that the slightest noise can be heard.
2 He was there for me when no one else was.
3 I got a head start on my homework at school.
4 I haven't had hair this short in a while.
5 If you don't want to wash it, let the shirt air out for a couple of days so it doesn't smell so much.
6 It's thanks to our government that we kids have school only 4 days a week.
7 I was doing my homework in bed and fell asleep at my notebooks.
8 You're the only person in the family I can laugh with and be myself with.
9 When she walks me to school, she walks so fast that I find myself 5 yards behind her all the time.
10 It seems like she's willing to give it a 2nd chance.
Comments  
Students: We have free audio pronunciation exercises.
Thank you Mister micawber,

Just one thing, for 5, would it be AT the armpits or On the armpits if you were to say it?

Thanks
Neither: 'in'.