Students are required to go out in couples, especially in the evenings, with friends ______ they get into trouble.
It was in the street __ this little girl saw a great scientist named Einstein for the first time in her life
A stranger ___ his room without his permission.
Let’s congratulate you ___ your success in every aspect of life and drink ___ it.
Suddenly I met a friend of ___ and we said hello to each other .
The concert he played sounded ___.