—How many birds can you see in the trees?—I can see _____ birds in them.
—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 ________.