In ___ year 751, the Chinese traveler Du Huan was taken __ _ prisoner by the Arabic army.
According a recent survey, if the factory closes, a lot of people _______ their jobs.
________ hard, and you will pass the final exam.
The past 30 years has ______ the great changes that have taken place in China.
– I’m sorry for what I said. -- Forget it, I can’t remember _________.
______ that the way people spend their holidays has changed a great deal in the past ten years.