At school, some students are active __________ some are shy, yet they can be good friends with one another.
. In no country other than Britain, it has been said, ____ experience for seasons in the course of a single day.
_ Mr. Morgan appears extremely cheerful in public, he is in fact leading a very unhappy life.
Was __ at the air battle on June 8,1994, ____ was led by Captain Johnson ___ Peter lost his life?
—I can’t find Mr. Smith. Where did you meet him this morning? —It was in the hall ____ our products were showed..
. It _____ Mary and Tom that often helped me at school.