7. William was not at home, _______was he at work yesterday? A. and B. so C. but D. nor |
8. If you don’t know what a word means, try to guess the meaning, _______ look up the word in the dictionary. A. nor B. or C. so D. for |
9. The discussion was quite short; _______ , we gained a lot of useful information from it. A. however B. therefore C. so D. moreover |