David has got everything ready, _________ it well.
| A．determined to do | B．to be determined to doing |
| C．determining doing | D．to determine to do |
.
______the zoologists tried to prove was that the photo of the South China Tiger had been staged or technologically dealt with.
| A．That | B．Why | C．Whether | D．What |
.
It is______the customers’ needs that has made chain stores so popular in big cities in China.
| A．meeting | B．met | C．to have met | D．being met |
.
Out of the crowded bus______,who was dressed in a black suit and waved to a woman.
| A．a tall man in his thirties stepped | B．stepped a tall man in his thirties |
| C．did a tall man in his thirties step | D．did a tall man step in his thirties |
.
By the time he comes back, I’m sure we ________ all these rooms of the lab. Therefore, he doesn’t have to return.
| A．have cleaned | B．will be cleaning |
| C．will have cleaned | D．have been cleaning |
.
________ their son away to college, the couple got more room in the house.
| A．As | B．For | C．With | D．Through |