Regulations _____ that students attend at least 90% of the lectures.
| A．demand | B．ask | C．require | D．request |
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 |