They lost their way in the mountain and _________ made matters worse was _______ it was getting dark.
| A．that, because | B．what, that | C．/, because | D．that, that |
Is this the shop _________ sells children’s clothing?
| A．which | B．where | C．in which | D．what |
October 1, 1949 was the day ________ the People’s Republic of China was founded．
| A．which | B．when | C．where | D．in which |
I think you have got to the point ________ change is needed, or you would fail
| A．when | B．that | C．where | D．which |
This is the bag ________ my mother bought yesterday．
| A．that | B．who | C．whom | D．this |
He made another wonderful discovery, _____ of great importance to science．
| A．which I think is | B．which I think it is | C．which I think it | D．I think which is |