Not until ________a third time ________that he had given birth to the reading system for the blind called Braille.
| A．Louis Braille tried; he announced |
| B．did Louis Braille try; he announced |
| C．Louis Braille had tried; did he announce |
| D．had Louis Braille tried; had he announced |
_____ her leg the last time, Brenda decided not to go on the school skiing trip this year.
| A．Breaking | B．Broken | C．To break | D．Having broken |
When you go to a foreign country, you must try to the customs there in order to recover from the culture shock quickly.
| A．deal with | B．adapt to | C．focus on | D． take over |
Will you take my previous experience into when you fix my salary?
| A．mind | B．thought | C．reference | D．account |
I would have come earlier, but I _____ that you were waiting for me.
| A．didn’t know | B．hadn’t know | C．would have known | D．haven’t known |
_______the thick clouds, you would find the kite in the sky easily.
| A．Had it not been for | B．If it were not |
| C．If it had not been for | D．Were it not for |