We all felt puzzled by the ______ answer he gave.
| A．generous | B．ambiguous | C．curious | D．concrete |
Matter is anything____
| A．that take up space and have weight | B．which take up space and have weight |
| C．that takes up space and has weight | D．those take up space and have weight |
She wrote a letter to her father, ___ she made her secret known.
| A．which | B．that | C．in which | D．where |
The factory ___ I am going to is the place ___ my mother used to work many years ago.
| A．where, where | B．where, which | C．which, where | D．that, which |
The last river __ _ they crossed is two miles wide.
| A．where | B．which | C．that | D．in which |
This is one of the means ____t he electic energy is conducted from one place to another.
| A．by which | B．by that | C．through which | D．through that |