– Why you didn’t handed in your exercise paper?
–Sorry, but I ____ that it should be turned in today.
| A．didn’t know | B．hadn’t known |
| C．haven’t known | D．don’t know |
______ he wants to say is ______ great an effort he has made to help her out.
| A．That; how | B．What; what | C．What; how | D．What; that |
______ I failed in English a third time, I had no doubt about my gift for foreign languages.
| A．By the time | B．Until | C．After | D．Unless |
— Jack, this is the third time that you have been late this week.
— Sorry, sir, but I was ______ for 15 minutes on the way here in the traffic jam.
| A．held up | B．put up | C．taken up | D．given up |
The driver tried everything he could think of, but the car just ______ not move.
| A．should | B．might | C．must | D．would |
Knowledge and learning are important if we want to be successful, but they may also ______ our thinking.
| A．direct | B．limit | C．change | D．improve |