The traffic accident _________all his life. After that he was limited to a wheelchair.
| A．damaged | B．destroyed | C．harmed | D．ruined |
The man showed us so heavy a stone ________ no man can lift.
| A．that | B．as | C．which | D．and |
Some pictures of the river brought the days back to the old ________ they swam in it.
| A．when | B．that | C．who | D．where |
Is this research center ________ you visited the modern equipment last year?
| A．where | B．that | C．the one that | D．the one where |
The humans are destroying nature day by day, ________ of course, will cause severe punishment from it sooner or later.
| A．who | B．when | C．on which | D．which |
The people, ________ had been damaged by the flood, were given help by the Red Cross.
| A．all whose homes | B．all of whose homes | C．all their homes | D．all of their homes |