________ on-going division between English-speaking Canadians and French-speaking Canadians is ________ major concern of the country
| A．The, / | B．The, a | C．An, the | D．An, / |
With the rapid growth of Cyberspace, everyone should be encouraged to use ______ Internet as ______ tool, making it a trend to study in virtual schools in the future.
| A．不填；a | B．不填; the | C．the; the | D．the; a |
----Bruce, I really appreciate your painting. 
---- .
| A．I practice every day | B．Thank you very much |
C．No, I don’t think so | D．Well, it’s not good enough |
It was about 600 years ago __________ the first clock was made.
| A．that | B．until | C．before | D．when |
He is wearing sunglasses to __________ his eyes from the strong sunlight.
| A．protect | B．prevent | C．save | D．help |
The policemen are searching _____ every house _____ the thief.
| A．for; for | B．of; of | C．不填; for | D．of; for |