---Bob was caught again when he was using his mobile phone in class so he was punished by the teacher. --- He _______ it; he always did it in class.
The college entrance examination is coming, the students are _____ it.
This is the school _____ they visited last year and is the one _____ my father once worked.
The enemy troop suddenly took the small village by surprise _____ a rainy morning.
--What is the model plane look like? --Well, the wings of the plane are _____ of its body.
Is this research center _____ the foreign guests visited last week?