．________ useful book is helpful to ________ artist.
| A．An, an | B．A, a | C．A; an | D．An; a |
__________at the gate of the theater, Susan found the ticket for the play was left at home.
| A．To arrive | B．On arriving | C．As arriving | D．While arrived |
The house_________was destroyed has now been repaired.
| A．the roof of it | B．whose roof | C．its roof | D．the roof of that |
---Mum, I hurt my leg when I climbed the tree.
--- You ___ that tall tree. I’ve told you many times.
| A．mustn’t have climbed | B．shouldn’t have climbed |
| C．couldn’t climb | D．may not climb |
It is said that in Iraq there are more violent accidents than the government knows .
| A．how to do with | B．how to do with it | C．what to do with | D．what to do with it |
Tsinghua University, in 1911,is home to a great number of outstanding figures.
| A．found | B．founding | C．founded | D．to be founded |