As is known to us all,the age_____children can go to school is seven.
at which
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If he ____ on tourists for his business,he would have to close his shop.
Hehasfourson,____(他们全部都是那个偏僻山村里的高级教师)。
Hedidn'tknowwhichroom____.
Who do you suppose is the man ____ our teacher is talking ?
The desk_____Tom is leaning is Jack's. It's covered with dictionaries.