He never sticks to them.
His previous resolutions made he stressed.
He saw other people’s unhappy experiences.
He is always too busy to make a resolution.
The researchers observed every student for another period of time to identify their popularity.
The researchers asked every student whether he/she felt more popular with their peers.
The researchers asked every student which classmates he/she most liked to spend time with.
The researchers collected parents and teachers’ opinions about students’ change in popularity.