Mary is such a lovely girl many of her classmates are willing to help when necessary.
No student ______go out of school after eleven o’clock at night without the teacher’s permission.
The scientist holds the view _______ the book said was right.
Don’t worry. I’m sure you’ll succeed _______ if you work hard.
The police spotted a thief________ things in a mall at this time yesterday.
In most western countries, on April Fool’s Day, people often play __ ___ trick on each other; children especially have great ______ fun.