7、I know the reason that she looks so worried.
 

       8、He left me the book, that is very useful for me.
 

       9、This is the room which food is kept.
 

       10、April 15, 1976 is the day when we’ll never forget.
 

       11、The man came yesterday is our English teacher.
 

       12、I know the student was praised at the meeting last week.
 

答案： 

7、that—why    8、that—which   9、which—where 
 10、when—which \ that  11、man后面加who  12、students后面加who 

 







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