---___________ will the weather be like tomorrow?--There will be a thunder storm. I don’t know _____ to do when the storm comes.
— My son seldom has breakfast. — It is unhealthy habit. You must ask him to change it.
The doctor _______ on the man and _______ saved his life.
Students can’t be made ____________ all day.
You know great changes _____________ in our school in the past ten years.
Paul doesn’t know _________ about his problems.