问题详情：
词汇运用；根据句意及汉语提示写出单词 （每空限一词）
1. You should knock at the door before you ________________(进入) the room.
2. During the _______________(二十)century, mobile phones become popular all over the world.
_______________ (通常), Andy goes swimming in the afternoon with his good friend David.
_________________ (想知道) how to cook when he saw his father cook nice food.
5. My father is an office worker in a big company. He is____________ (超过)forty years old now.
【回答】
r tieth l ered
知识点：单词拼写
题型：单词拼写
