1.Being ________ (energy) in class is important for students to study.
【答案】energetic
【解析】Being后面加形容词，构成系表结构，energetic，形容词，精力旺盛的。故填energetic.
2.It is generally accepted that smoking is ________(harm) to our health.
【答案】harmful
【解析】考查形容词。句意：人们普遍认为吸烟有害健康。be harmful to对......有伤害，故填 harmful.
3.Harry Porter is the __________ (interesting) book that I have ever read.
【答案】most interesting
【解析】考查形容词的最高级。根据句意，Harry Porter是我曾经读过的最有趣的书。可知需用形容词最高级作表语。interesting有趣的，形容词词原形；the most interesting最高级。故填most interesting.
