These doctors are busy day and night, a cure for AIDS.
| A．bringing on | B．pulling on | C．taking on | D．working on |
She was to George for all that he had done for her.
| A．loose | B．lonely | C．tired | D．grateful |
There is something wrong with this bill.Please all the items again.
| A．Add up | B．set down | C．put down | D．look up |
---Are you going to London for a holiday?
---___________．
| A．That all depends | B．That’s nothing |
| C．It doesn’t matter | D．If you like |
On the other side of the street stand more than 180 houses, _______are in poor condition now．
| A．of which half | B．which half of |
| C．half of them | D．of them half |
I first met Mr Smith in America. He ________ at Stanford University then.
| A．studied | B．had studied |
| C．is studying | D．was studying |