She thought _______impossible to finish so much work in a day.
| A．this | B．that | C．its | D．it |
By the end of this year, 160 new students ___ in the English Department of this world famous university．
| A．have enroll | B．will have enrolled |
| C．have been enrolled | D．will have been enrolled |
As a new-comer of the class, Sarah hopes to become a friend of___ shares her interests and has common outlooks．
| A．whoever | B．whomever | C．no matter who | D．anyone |
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 |