Vivien worked very hard at all her lessons. __________, she became the top student in her class.
We should eat many fruits ________ apples and oranges.
The actors __________ in the movie.
—How many birds can you see in the trees?—I can see _________ birds in them.
—Where is Miss Wang?—She went to Hainan Island last week and will return _______ six days.
There will be _________ pollution this year than last year.