—I wonder how much you charge for your services.
—The first two are free the third costs $30.
| A．while | B．until |
| C．when | D．before |
--- Is it true that Mike refused an offer from Yale University yesterday?
--- Yeah, but I have no idea _______ he did it; that’s one of his favorite universities.（2014）
| A．when | B．why | C．that | D．how |
—The two people speak different languages and can not communicate with each other well.
—Oh，I see. That’s ________ misunderstanding occurs.
| A．when | B．what |
| C．which | D．why |
An completely new district of industry has appeared in ________ used to be wasteland.
| A．which | B．that |
| C．what | D．where |
Now _______ you have to do is to admit your mistakes and immediately correct them.
| A．that | B．whether |
| C．what | D．how |
Word came, as expected, ______ college entrance English exam will be reformed soon.
| A．it | B．what |
| C．which | D．that |