Ann is so careful that she always goes over her exercises to _______ there are no mistakes.
. --What did you think of the performance given by the famous dancer? ---Not so good. In fact, it ________ to be a great disappointment.
. It is written clearly in the requirements that all passengers______check onto board thirty minutes before the plane takes off.
. The size of the audience, ______we had expected, was well over one thousand.
. ______the zoologists tried to prove was that the photo of the South China Tiger had been staged or technologically dealt with.
. It is______the customers’ needs that has made chain stores so popular in big cities in China.