20.American women usually identify their best friend as someone ____ they can talk frequently.
.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.
.Out of the crowded bus______,who was dressed in a black suit and waved to a woman.