单项选择（每题1分）
She opened the window, _____ in some fresh air.
| A．letting | B．let | C．to let | D．to be let |
General Secretary，Xi Jinping stressed that cross－strait cooperation would be strengthened________ the two sides could agree to oppose Taiwan independence．
| A．unless | B．even if |
| C．as long as | D．until |
－How did you find those days？
－The days________ we spent together on the farm are not easy________．
| A．that；to forget | B．when；to be forgotten |
| C．when；to forget | D．that；to be forgotten |
George once told me that he would visit our house，but，for various reasons，he ________so far．
| A．didn't | B．hasn't | C．hadn't | D．wouldn't |
－Look，here________．
－Oh，it's my secretary．But I________ him to pick me up at seven o'clock．
| A．comes a car；had told | B．comes a car；told |
| C．does a car come；had told | D．a car comes；to |
－Personally，I believe I can do it well on my own．
－________Selfconfidence is the first secret of success．
| A．It's up to you． | B．Take it easy． |
| C．Let' s get going． | D．I'm with you on that． |