—Excuse me, I’m looking for my umbrella.—Oh, sorry. I took ________by mistake.
One way to understand thousands of new words is to have________ good knowledge of basic word formation.
A sudden blizzard occurred in Beijing last night, ______great inconvenience in transport.
About 60 percent of the students ________ from the south, the rest of them ________ from the north and foreign countries.
Now Tom with his classmates ________ football on the playground.
With two children ______ middle school in the nearby town now, the parents are working hard.