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18. I don’t like to watch English-language videos because B it’s ___ hard ___ the videos . A. so ; to understand B. too ; to understand C. too ; not to understand D. so ; not understand C 19. We didn’t like the song at first , but we ended up ____ it with the singer . A. to sing B. sing C. singing D. as singing D 20. When our school team won ,we got excited ___ it . A. with B. at C. for D. about B 21. It’s easy ___ the foreign teacher because he stayed in Canada for four years . A. of him to understand B. for him to understand C. for him understands D. to him understanding