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.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.