When our ancestors were hunters and gatherers 10,000 years ago, they didn’t have time to wonder much about ________ but finding food.
I stayed there for only two days but ______ felt like two weeks.
—Mr. Hu , have you finished correcting the papers? —Not yet, the papers _______. You _______ get the results from me by tomorrow.
—I like your new shoes! —Thanks.I had to try on almost a dozen pairs ______ I decided to get them.
Unemployment in USA is likely to remain high in 2011, and _______ for the next few years.
I didn’t make sense of _______poem until I read it _______ third time.