X.单词拼写共5小题;每小题1分,满分5分)根据首字母及汉语提示,完成下列单词的拼写,使句意明确,语言通顺。76.You still look p(苍白的).You'd better go to a doctor.s77.Being a football c(教练),though he faces many challenges,he never gives up.78 The firemen quickly put out the fire before it b(燃烧)the whole building.79.The 1 (juice is so sour that we have to put a lot of sugar in it.80.With hard work,he hopes to m(掌握)this difficult skill soon..