He paid for a seat, when he _____ have entered free.[ ]

eople in China are ________ a “HopeProject”, helping poor children to get compulsory education．

_______ only 20 minutes to go before the train left, I felt uneasy in the taxi to the railway station.

So much ______ by the poem for the Wenchuanearthquake that he decided to participate in the re-construction of the damagedregion.

Scientists have many theories about how the universe_____