They will finish the invention before 2021. * 1 điểm A. The invention will be finished before 2021 by them. B. The invention will be finished before 2021. C. The invention will finished before 2021. 17. John was very surprised that he got his mother's letter yesterday. * 1 điểm A. John was very surprised to get his mother's letter yesterday. B. John was very surprised so he got his mother's letter yesterday. C. John was very surprised so that he got his mother's letter yesterday. 18. She pushed the wheelchair to the ambulance for the victim. * 1 điểm A. The ambulance was pushed to the wheelchair for the victim. B. The wheelchair was pushed to the ambulance for the victim. C. The wheelchair was pushed her to the ambulance for the victim. 19. They took their children to Dam Sen park last month. * 1 điểm A. Their children were taken to Dam Sen park by them last month. B. Their children were taken to Dam Sen park last month. C. Their children was taken to Dam Sen park last month. 20. I am very sad because I cannot join the school football team. * 1 điểm A. I am very sad that I cannot join the school football team. B. I am very sad not join the school football team. C. I am very sad but I cannot join the school football team.