－Why does the river smell terrible?
－Because large quantities of water______．
| A．have been polluted | B．is being polluted |
| C．has been polluted | D．have polluted |
Is this the reason _______ at the meeting for his carelessness in his work?
| A．he explained | B．what he explained | C．how he explained | D．why he explained |
1Mary was always singing high praise for her role in the office, _______，of course,made her colleagues unhappy.
| A．who | B．which | C．this | D．what |
After 10 years of hard time,the young lady has turned movie star, _______ she dreamed of becoming in her childhood.
| A．who | B．which | C．that | D．what |
We have eight foreign teachers in our school,five of _______ are young ladies.
| A．them | B．whom | C．who | D．which |
I work in a business _______ almost everyone is waiting for a great chance.
| A．how | B．which | C．where | D．that |