Silk from China found its way to India, the Middle East and Rome，__________ spices and glass, which were not known to China.
| A．in exchange for | B．in return | C．in change for | D．in need of |
_____, we need to imporve the equipment in our factory.
| A．As it is | B．As it was | C．As it were | D．As it will be |
_____ writer, she is excellent, _____ teacher she is not very good.
| A．As; but as | B．As; and as | C．As a ; but as a | D．As a; and as a |
_____, the population of China is the largest in the world.
| A．It is known that | B．As is well known |
| C．Which is well known | D．We all know that |
_____，I can’t express myself in words.
| A．So long as I am fond of | B．Now that I am fond of |
| C．Much as I am fond of her | D．As I am fond of very much |
She had golden hair when she was a child, but_________ she got older and older, her hair went darker and darker.
| A．while | B．when | C．after | D．as |