When asked to explain _____ he did to make his students so fascinated with his lessons, the teacher paused and thought deeply.
| A．what was it that | B．that what it was |
| C．what it was that | D．what was it |
"Who Moved My Cheese?", ____________ is a best-selling book, is written by Spencer Johnson．
| A．which | B．that | C．it | D．what |
—I'd like to have some lunch but I have to stay here doing my work．
—___________ what you want and I can get it for you．
| A．To tell me | B．Telling me |
| C．If you tell me | D．Tell me |
— Show me your permit, please．
—Oh, it's not in my pocket．It
| A．might fall out | B．could fall out |
| C．should have fallen out | D．must have fallen out |
—Why ! Where's my passport? Maybe I left it on the plane．
--My Goodness ! You ____________ things behind．
| A．had never left | B．didn't leave |
| C．never left | D．haven’t left |
I tried hard to get some information about the new technology out of his mouth, but he remained_________．
| A．quiet | B．secret | C．silent | D．calm |