4.She owes her wealth_____hard work and good luck.
| A．for | B．on | C．to | D．at |
Sixty miles ________ in a single night, so they were exhausted.
| A．were covered | B．have covered | C．was covered | D．has covered |
--- Had we been more careful, the accident might not have happened.
--- But we _____ at that time.
| A．hadn’t | B．didn’t | C．weren’t | D．might not |
He will stop showing off，if no notice of him．
| A．is taken | B．will be taken | C．taken | D．has taken |
—Remember the first time we met, Jim?
—Of course I do. Youin the library.
| A．were reading | B．had read | C．have read | D．read |
What I wanted to know was when and where the meeting______.
| A．was holding | B．had held | C．was to hold | D．was to be held |