`\text{Có giải thích}` 1. The lecturer explained the problem very clearly and was always ______ in response to questions. A. attention B. attentiveness C. attentively D. attentive 2. Attempts must be made to_______the barriers of fear and hostility which divide the two communities. A. break down B. set up C. get off D. pass over 3. The director informed that no candidate ______ all the criteria for the administrative position. A. completed B. fulfilled C. achieved D. suited 4. I always wanted to work for that company but it took me 5 years to get a foot in the ______. A. building B. house C. door D. block