Unit 2 My schoolbagPeriod 5開心回顧一、單項選擇1 pen is lost!A. You B. I C. My【答案】C【解析】句意：我的鋼筆丟了。名詞前面要加形容詞性物主代詞，故選C。2Where are the _____?A. a key B. key C. keys