题目内容

用所给单词的适当形式填空。
1. I built one of my rockets _____ (I)
2. I _____ (lose)one of my books yesterday.
3. Danny has been _____ (launch) rockets for two years.
4. —How _____ (much) pens do you have?
    —Four.
1. myself  
2. lost  
3. launching  
4. many
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