用“介词+关系代词”完成下列各句
I'11 never forget the day _______  _______ for the first time.
The boy _______  _______ I took a photo turned out to be our English teacher's son.
The place _______ _______ I wish to pay a visit is of course the Great Wall.
I've some money _______ _______  I will buy my mother a watch for her birthday.
You'd better put a pen in your bag _______ _______  you can take notes anytime.
This is an accident_______ _______  the car driver should take full responsibility.
The person _______ _______  I owe a lot is my father.
The girl is only 8 years old, an age_______ _______  many others are still taken care of by their parents.
He is the person _______ _______ you can turn for help.
He is the man _______ _______  you can depend.
Jack is a popular teacher,_______ _______  help many students have made great progress.
The English play _______  _______  my students acted will be put on next week.
I have many friends, _______ _______  some are teachers.