—Mary, don’t you believe your sister?
—Yes. I believe _____ she says.
| A．however | B．no matter how | C．whatever | D．no matter what |
I won’t call you ________ something unexpected happens.
| A．while | B．whether |
| C．because | D．unless |
The foreign guests, ____ were government officials, were warmly welcomed at the airport.
| A．most of them | B．most of which |
| C．most of whom | D．all of those |
He is writing a letter______ a pen that I have never seen before.
| A．by | B．with | C．for | D．at |
________ the boy didn't take medicine made his mother angry.
| A．That | B．What |
| C．How | D．Which |
I don’t know ________ is in charge of English department.
| A．that | B．which | C．who | D．where |