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________ the course very difficult，she decided to move to a lower level.(2013·北京，24)

The witnesses ________ by the police just now gave very different descriptions of the fight.                                                             (2013·陜西，14)

Let those in need ________ that we will go all out to help them.          (2013·陜西，13)

The airport ________ next year will help promote tourism in this area.        (2013·四川，10)

________ which university to attend，the girl asked her teacher for advice.   (2013·四川，8)

There are some health problems that，when ________ in time，can become bigger ones later on.                                                         (2013·浙江，19)

Lionel Messi，________the record for the most goals in a calendar year，is considered the most talented football player in Europe.                                  (2013·江蘇，24)

________ in the early 20th century，the school keeps on inspiring children’s love of art.                                                                       (2013·安徽，32)

________ an hour every day has made a considerable difference to my health.

________to get a seat for the concert，he didn’t mind standing in a queue all night.