13.Not until I was a senior student_________the importance of English.
I want to use the same dictionary ________ was used yesterday.
After living in Pairs for fifty years he returned to the small town ________ he grew up as a child.
________ is known to everybody,the moon travels around the earth once every month.
—So you have met Maria?—Yes,it was last week ________ we attended Jack’s party.
I was given three books on cooking,the first ________ I really enjoyed.