Was __ at the air battle on June 8,1994, ____ was led by Captain Johnson ___ Peter lost his life?
Young students are ______ not to smoke, either in or out of school.
The reason he was absent from class was his mother fell ill this morning.
The leader of the factory told us that very little ______ was made of the waste material in the past.
_____ of the students who took part in the military training is 450.
—How many times have you been to China? —In fact, it is the first time that I__________ here.