At the meeting they discussed three different ________o the study of mathematics．
| A．approaches | B．means | C．methods | D．ways |
If you are traveling___ the customs are really foreign to your own, please do as the Romans do.
| A．to which | B．in which | C．that | D．where |
The temple is carved in rocks and has on the outside four large stone statues, ______ is 20 metres high.
| A．each of them | B．which | C．and each of that | D．each of which |
It was an exciting moment for the football fans, ______for the first time in years their team won the World Cup..
| A．which | B．that | C．when | D．where |
It was a serious mistake, ______ caused by carelessness.
| A．which I think was | B．which I think it was |
| C．I think which was | D．that I think it was |
____ is known to everybody, the moon travels round the earth once every month.
| A．it | B．As | C．That | D．What |