Tom hit Steven ___ the head, but Steven struck Tom ___ the face.
| A．on, in | B．in. on | C．in, in | D．on, on |
________there is no law stating how you may dress，not all fashions are respectable.
| A．Because | B．Since |
| C．While | D．Unless |
I will put the book________you placed it and make a mark at the place________I put it.
| A．where；at which | B．at which；at which |
| C．where；which | D．at which；where |
________ you may have，you should gather your courage to face the challenge.
| A．However a serious problem |
| B．What a serious problem |
| C．However serious a problem |
| D．What serious a problem |
—Haven’t seen Lucy recently，what’s happened?
—Oh，it’s more than two months ________ she worked here.
| A．which | B．that |
| C．before | D．since |
________you’ve experienced it，you can’t understand how I felt.
| A．Once | B．Because |
| C．Unless | D．While |