She walked home by herself at night, _____ she knew that it was dangerous.
A. once B. as C. unless D. although
We _____ close friends since we got to know each other in 2006, and we always keep in touch.
A. were B. have been C. will be D. had been
I _____ some knowledge of cooking just by watching my mother doing it.
A. put up B. looked up C. picked up D. set up
Tom’s mother bought quite a lot of things online but spent only $20 _____.
A. in order B. in a word C. in all D. in conclusion
Either you or I _____ going to attend the meeting in the afternoon.
A. are B. am C. is D. will
Students should be encouraged to use _____ Internet as _____ resource.
A. 不填, a B. 不填, the C. the, the D. the, a
