Teach children ______ electrical appliances, cords, and switches are not toys.
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.
—I missed the first part of the film. It was really a pity.—You __________ home half an hour earlier.