In the US they focus on creative thinking skills, _____ in China they only focus on theory．
| A．since | B．when | C．while | D．now that |
----Have you finished your homework?
-----No, I ________ my younger sister all day yesterday.
| A．was looking after | B．would look after |
| C．had looked after | D．look after |
My friend Mary is _____ beautiful girl and _____ girl everyone likes to work with.
| A．a, a | B．a, the | C．the, a | D．the, the |
Many of the students applied to the university , but ________of them is admitted .
| A．None | B．No one | C．Neither | D．all |
The door opened and in ______ .
| A．came she | B．did she come |
| C．did Miss Gao come | D．she came |
Obama , the first black president in American history , _______ presidency on January 20th ,2009.
| A．held up | B．took up | C．picked up | D．set up |