把下列简单句改成定语从句
1、that is the student .the headmaster praised him at the meeting last week.
that is the student （ ）（ ）（ ）（ ）the meeting last week.
把下列定语从句改成简单句
2、all that I need is your help
（ ）i need is your help
3、He had a bad cold,because of which he did not attend the meeting
he did not attend the meeting（ ）（ ）a bad cold.