Many a student _____ playing games on the playground and only one girl or two _____ reading in the classroom.

She does not know _____ the situation, for she is too inexperienced.

It’s really cold here I have neverexperienced such terrible weather in my life

Not until all the fish died in the river ________ how serious the pollution was.

the ______ of this medical technology, some diseases can be treated at an early stage.