◎ 题干
用单词的适当形式填空。
1. My aunt _____ (teach) me to play the violin when I was a child.
2. Look! The people in the river ______ (swim).
3. Tree-planting Day is on the ______ (twelve) of March every year.
4. Stephen spends about half an hour ______ (swim) every Saturday afternoon.
5. I don't like travelling by train. I think it's ______ (safe) to travel by train.
6. —I'm tired. 
    —So am I. We'd better stop ______ (walk) and have a rest.
7.  Plants need CO2 when they grow, so they can make CO2 ______ (little) in the air.
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“用单词的适当形式填空。1. My aunt _____ (teach) me to play the violin when I was a child.2.Look! The people in the river ______(swim). 3. Tree-planting Day i…”主要考查了你对  【序数词】【形容词】【动名词】【一般过去时】【现在进行时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。