1．I am going to travel around the world．

I am going to travel                     the world．

2．He plays basketball best in his class．

He plays basketball                any other student in his class．

3．There are over fifty boys in the big room．

There are                fifty boys in the big room．

4．They had a great time in his birthday party last week．

They                in his birthday party last week．

5．He is too young to join the army．

He isn't               to join the army．