It was not until dark ______ he found that it was the correct way to solve the problem.
| A．that | B．what | C．which | D．when |
There isn't such a word ______ I know.
| A．as soon as | B．as long as | C．so long as | D．so far as |
______ 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 |