A)根据句意填入适当的词。

     1. He should be _________ to come into the room.

     2. He is _______because he often does foolish things like this.

     3. He often ______ with his friends on the Internet.

　　　4. I want be a ______ in the Olympic Games 2008 of Beijing.

     5. Children like watching _______. Some adults also like watching them, too.