A report on history in our school next month.
He is very happy , because he _____ in a big apartment next year.
—How many birds can you see in the trees?—I can see _________ birds in them.
A dog robot could help ____ the room.
—Where is Miss Wang?—She went to Hainan Island last week and will return _________ six days.
There will be ____ cars and ____ pollution twenty years later.