一、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 friends.
5．There are seven ________ (洲) in the world.
