The Olympic Rings _________ the five parts of the world.
| A．stand on | B．stand for | C．stand | D．standing |
His English ________ a lot since he took the course.
| A．improved | B．was improved | C．has improved | D．has been improved |
We will give you a good price ________ you are thinking of buying it.
| A．until | B．and | C．so that | D．if |
I become ________ in American history.
| A．more interested and more interested | B．more and more interested |
| C．more interesting and more interesting | D．more and more interesting |
She often sends ________ to me on her mobile phone.
| A．information | B．messages | C．news | D．suggestion |
I have been living in London for more than ten years, so I have ________ good knowledge of this city.
| A．/ | B．the | C．a | D．an |