while vs during

I found my lost keys .............. cleaning out the garage.

............... our vacation to Europe, we explored ancient ruins and modern cities.

They made plans for the summer ................. their vacation.

The children played outside while ...............

During ................ , passengers were instructed to fasten their seat belts due to turbulence.

While waiting at the doctor's office, she ............ a magazine to pass the time.

While studying for exams, she ........... helpful to review notes from previous lectures.

She sometimes sleepwalks during she sleeps.

1. No one spoke ......... the first 30 minutes of the meeting.

While we waited for a table, Doreen and I ............ our plans for after dinner.