We can't understand ______ a decision until it is too late.
| A．him to postpone to make | B．his postponing to make |
| C．him to postpone making | D．his postponing making |
______ 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 |
______ you ever have any trouble, let me know.
| A．If | B．Whenever | C．While | D．X |