Calm ​and tell me what happened. A. out​B. down​C. in​D.up 12. Sam was trying hard ​. A. not to laugh​ B. to not laugh​C. not laughing​ D. to not laughing 13. You ​forget what I told you. It’s very important. A. mustn’t​ B. needn’t​ C. don’t have to​ D. can’t 14. Cool the burns immediately so as to ​tissue damage. A. ease​ B. relieve​ C. minimize​D. maximize 15. ​ is a long stick that someone put under their arm to help them, walk when they have hurt their leg. A. Crutch​ B. Wheelchair​ C. Stretcher. ​D. Bandage Phải lắm đúng nha