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分层限时跟踪练 Ⅰ.单句语法填空 1．I am puzzled(puzzle)by his failure to reply that he hasn't replied to my letter. 2．It was said that this was the only copy of the book in existence(exist)． 3．As we all know，a bad eating habit is harmful(harm) to one's health. 4．Unlike(like)what he said，he didn't carry out his promise. 5．As the old saying goes，it is easier to_pull(pull) down than to build up. 6．Give Mary a call；she needs cheering up. 7．I was warned to watch out for the terrifying dog. 8．Last night a fire broke out in the hotel across the street. 9．Last night，Mrs.Green had a heart attack.But luckily，the doctor came in time to save her life. 10．Class Three should be responsible for raising the red flag this week in its turn. Ⅱ.完成句子 1．如今，违反交通规则和乱扔垃圾的现象很常见，对生活和环境造成了严重的破坏。 These days，breaking traffic rules and littering are not uncommon，causing_serious_harm_to_life_and_the_environment. 2．很久以前地球上存在着体形庞大的动物。 There_existed_huge_animals_on the earth a long time ago. 3．她脸上迷惑的表情表明她不明白我说的话。 | 
