________ doesn’t seem to have been much difficulty in solving the problem.
| A．It | B．That | C．There | D．He |
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 |
______, the library was closed.
| A．Sunday | B．Being Sunday | C．It to be Sunday | D．As it was Sunday |