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 |
It’s known ___ us that a mouse has a good nose ___cheese.
| A．for ; for | B．to ; for | C．by ; to | D．by ; at |
Doctors are often in ____ dilemma over whether or not to tell their patients ___ truth about their condition.
| A．a ; a | B．a ; the | C．/ ; a | D．/ ; the |
-- Must you play the guitar so loudly ? I can hardly ___ my book .
--- I’m sorry. I didn’t know you were reading .
| A．pay attention to | B．rely on | C．catch sight of | D．concentrate on |
Jack is late again. It is ___ of him to keep others waiting.
| A．normal | B．ordinary | C．common | D．typical |
--- Thank you for keeping me ___ of everything that’s happening.
--- Don’t mention it .
| A．inform | B．informed | C．informing | D．to inform |