It is the test system, _____ the teachers, that is to blame for the heavy burden of middle school students nowadays.
______ in thought, he almost ran into the car in front of him.
—What did your parents think about your decision?—They always let me do ______ I think I should.
The thought ______ he might fail in the exam worried him.
My home village is no longer the same ______ it used to be.
The gentleman ______ you told me yesterday proved to be a thief.