since和for的题目,

题目

since和for的题目,
I have been studying at NESE_________ january.
My head hurts!I have had a headache_______________four hours.
Jake hasn't worked__________last summer.
He has been unemployed___________seven months.
I am so hungry!I haven't eaten anything_______yesterday morning!
We haven't eaten anything__________a day! 
They have been playing tennis _____________9：00 am.

答案

I have been studying at NESE__since_______ january.
My head hurts!I have had a headache________for_______four hours.
Jake hasn't worked____since______last summer.
He has been unemployed_____for______seven months.
I am so hungry!I haven't eaten anything__since_____yesterday morning!
We haven't eaten anything___for_______a day!
They have been playing tennis _____since________9：00 am.