--____, Tom. Is this your book?--No, it isn’t. I think it’s ____.
—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 ________.