Students must be strict ____ their studies and teachers should be strict _____ their students.
He was very ill, but now he is out of danger.
He could play the violin when he was five.
The students ought to wear school uniforms when they’re at school.
Mr. Green is very happy because he is satisfied with his students’ work today.
_______ the teachers in their school is about 200 and one fourth of them are _______ teachers.