John was fired by his factory and only then ________ how wrong he was to be lazy and careless.[ ]

What color is it —________________.

Do you mind if I open the window—_____, I feel a bit cold.

How many teachers are there in your school—Over four______. And ______ of them are women teachers.

The reason ____the little actress has been such a success is ____she is both clever and hard-working