10. Each nation has many people who _________ take care of others. A. volunteers B. voluntarily C. volunteer D. voluntary 11. The students failed in that competition because they didn’t understand the competition’s_____ clearly. A. difficulties B. rules C. enjoyment D. spirit 12. Each group has to ________ five activities in all. A. finish B. complete C. sponsor D. A and B 13. We ___________ dinner before we went to bed. A. had B. were having C. had had D. have 14. He ________ a letter from his parents recently. A. have received B. has received C. received D. had received 15. My students hope _______ into the football team of the school. A. choosing B. being chosen C. to choose D. to be chosen NHỚ GIẢI THÍCH GIÚP MÌNH