unit 5 第一课时 ⅰ.单词拼写 1．the plane crashed killing all 157 passengers ________ (在飞机上)． 2．two pieces of ________ (行李) have gone missing, which makes the woman very sad. 3．there is a national park on the ________ (边界) between kenya and tanzania. 4．my kids spend hours ________ (聊天) on the phone to their f
