You must apply yourself_______ the study you have to take up.
| A．on | B．for | C．to | D．of |
______ 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 |
— Would you mind giving your advice on how to improve our business management?
— If you make ______ most of the modern equipment, there will be ______ rise in production.
| A．/; / | B．the; a | C．/; a | D．the; / |