Teenagers are not allowed to stay out late _ school nights.
It’s very kind ____ them to pick me up at the railway stationand drive me home.
–What do you often do ____ classes to relax yourself?–Listen to music.
We looked at each other ____ surprise when we heard a bird singing “Happy birthday to you”.
She will leave her homework ____ the teacher’s desk afterschool today.
–How do you learn English so well? –____ chatting with my uncle in America online.