根据所给首字母或汉语提示，将单词的正确形式写在题后相应的横线上。1. David is thirteen y1.years 2. difficult 3.play 4.stric

根据所给首字母或汉语提示，将单词的正确形式写在题后相应的横线上。
1. David is thirteen y1.years 2. difficult 3.play 4.strict 5. third old.
2. It is a d　 question. I can’t answer it.
3.Lisa can p　 the piano very well .
4.Our math teacher is very s　 with us .
5. Tuesday is the t　 day of a week.

解析：【小题1】句意“大卫十三岁了。”故填years。【小题2】考查形容词。这是一个很难的问题，我回答不了。故填difficult。【小题3】考查固定搭配。play the piano弹钢琴，故填play。【小题4】考查固定短语。be strict with sb对某人严格。故填strict。【小题5】考查序数词。周二是一周的第三天，故填third。

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