Since the time humankind started gardening, we _ _ to make our environment more beautiful.
| A．try | B．have been trying |
| C．are trying | D．will try |
I still remember the sitting-room _______ my mother and I used to sit in the evening．
| A．what | B．which | C．that | D．when |
Is this museum ________ they visited last month?
| A．that | B．which | C．where | D．the one |
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 |