We decide to make ________ a rule for us room-mates to turn off the lights at 10:30 pm.

___all kinds of difficulties,the work-ers have made rapid progress in the construction of the World Expo 2010 Shanghai.[ ]

_____ you somewhere before, but yourname has escaped me_________

Listen! Who _____ in the music room—It must be Jane. She usually _____ at this time every day.

______ wonderful the voice is! Who’s singing in the garden— It must be Linda. Many people think she sings as well as Taylor Swift.