To get an education, _________.
| A．working hard is very important | B．working hard is needed |
| C．one must work hard | D．it is needed to work hard |
---What do you think of the American singer Lady Gaga’s performance?
---Too crazy, but if I _____to her concerts held yesterday, I would have enjoyed it.
| A．would go | B．went |
| C．had gone | D．should go |
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 |