Not until he failed the exam _______he had left his books untouched .
| A．did he realize | B．had he realized | C．he realized | D．he had realized |
For professional athletes, ________ to the Olympics means that they have a chance to enter the history books.
| A．access | B．attachment | C．appeal | D．approach |
Try to spend your time just on the things you find _________.
| A．worth doing them | B．worth being done |
| C．them worth doing | D．worth doing |
On snowy days, you have to drive very to avoid traffic accidents.
| A．cautiously | B．neatly | C．smoothly | D．properly |
—You may find the key to the maths problem on page 107.
—Ah, it’s so simple. I wonder why I ＿of that.
| A．hadn’t thought | B．haven’t thought |
| C．didn’t think | D．wasn’t thinking |
The long and tiring talk, filled with arguments and quarrels, ended in disorder, _________ no agreement at all.
| A．reaching | B．reached | C．to reach | D．being reached |