11. How time flies! You should make _____ use of your time.
| A．best | B．the worst | C．good | D．the best |
You can choose _____ book you like among these.
| A．no matter what | B．whatever | C．whose | D．whichever |
______ she said this, she regretted it.
| A．The time | B．The moment | C．The hour | D．The day |
Another driver had just driven into the back of Jack's car ______ he was waiting at some traffic lights.
| A．since | B．once | C．while | D．during |
She looks pretty ______ she wears.
| A．in | B．whatever | C．what | D．which |
It's ______ he helped you that I'm ready to help him.
| A．the reason | B．for | C．because | D．since |