---What do you think made Mary so upset?
--- ______ her new bike.
| A．As she lost |
| B．Lost |
| C．Losing |
| D．Because of losing |
You can’t catch the charm of English poetry ___you understand its rhythm．
| A．if | B．unless | C．though | D．while |
The word "breakthrough" is often used when talking about the newest drug or the next treatment ___ in cancer research．
| A．finding | B．being found | C．to be found | D．found |
October 24, 1860, the Qing government and the Britain sighed "the treaty ofBeijing", ___ put an end to the second Opium war．
| A．which | B．that | C．when | D．in which |
___ the invention of the steam engine, the industrial revolution played a vital role in human history．
| A．Originating in | B．Originated in |
| C．To originate in | D．Being originated in |
Blog, a shared on line journal where people can post diary entries about their personal experience and
hobbies, ___ more and more popular with people of all ages．
| A．becomes | B．become |
| C．becoming | D．is becoming |