There is a limit __________ people's life, but no limit __________ the knowledge.
| A．on; to learn |
| B．to; to learn |
| C．on; learning |
| D．to; to learning |
Yesterday, Jane walked away from the discussion. Otherwise, she ____ something she would regret later.
| A．had said | B．said |
| C．might say | D．might have said |
If only he _______ quietly as the doctor instructed, he would not suffer so much now.
| A．lies | B．lay |
| C．had lain | D．should lie |
It is hard for me to imagine what I would be doing today if I ____ in love, at the age of seven, with the Melinda Cox Library in my hometown.
| A．wouldn’t have fallen | B．had not fallen |
| C．should fall | D．were to fall |
It has been raining for a day, but even though it hadn’t rained, we _____ there by tomorrow.
| A．can’t get | B．won’t get |
| C．hadn’t got | D．wouldn’t get |
If I hadn’t been lucky enough to meet you. I really _____ what I would have done.
| A．don’t know | B．hadn’t known |
| C．wasn’t knowing | D．wouldn’t know |