Her son was accused of cheating by the police, ________ made it difficult for her to go to sleep.
A．what B．as
C．which D．where
The Olympics are like a huge stage ________ everyone makes every effort to achieve their dreams.
A．that B．when
C．which D．where
I went to that fancy restaurant with my wife yesterday, ________ chefs are really brilliant.
A．when B．which
C．who D．whose
He met Rachel at her college graduation ceremony in 2011, ________ he was later to marry.
A．which B．when
C．where D．whom
—When did you get home last night?
—It was almost midnight ________ we arrived home.
A．that B．before
C．since D．when
________ is known to all is that effective measures should be taken to deal with the problem of the overexploitation of our resources.
A．What B．It
C．As D．Which
