Nowadays, either 21st Century or other English newspapers _____ increasingly popular among us students.
| A．are | B．is | C．were | D．was |
______ others in the reading room, Jack walked in on tiptoes.
| A．Not disturbing | B．To not disturb |
| C．Not to disturb | D．Not having disturbed |
He suggests the number of cars should be limited to stop air pollution. ______, the idea is not very practical.
| A．Sounds good as it | B．As it sounds good |
| C．As good it sounds | D．Good as it sounds |
—Why do you know so much about The Youth Olympic Games to be held in Nanjing?
—Well, the media ______ it in a variety of forms.
| A．cover | B．will cover |
| C．have covered | D．covered |
Much to my surprise, I found the education system of the USA was totally different from ______ of my home country.
| A．it | B．that | C．one | D．what |
Lessons can be learned to face the future, ______ history cannot be changed.
| A．since | B．as | C．though | D．unless |