1) He has a thunder face. （黑头黑脸)
2) my lips are sealed.
3) blow hot and cold （三分钟热度）
4) thanks for helping in our hour of need (雪中送炭)
at a time when someone needs help very much I shall never forget that they were the people who helped me in my hour of need.
5) Goose bumps (鸡皮疙瘩)
