----My son always goes to school without having ______ breakfast.----It is ______ unhealthy habit. You must ask him to change it.
—How often does your brother go swimming? —________.
I can’t learn math well. Can you give me some ________?
They are going to have a picnic _______ next week.
There are about ________ students in our school.
—Do you like our English teacher? —Yes. I think his class is very ________.