His parents were teachers in that school, _______ lost their lives in order to save their students in the earthquake.
| A．none of them | B．both of them | C．none of whom | D．both of whom |
To prevent this from happening again, John Snow suggested that the source of all the water supplies __________.
| A．be examining | B．should be examined |
| C．was examined | D．to be examined |
__________ after a whole day's work that he could hardly stand it.
| A．So he was tired and hungry | B．Was he so tired and hungry |
| C．So tired and hungry was he | D．So tired and hungry he was |
That is the only way we can imagine __________ the overuse of water in students' bathrooms.
| A．reducing | B．reduced |
| C．to reduce | D．reduce |
It's wise of parents to chat and exchange ideas with their kids __________ dinner.
| A．for | B．at |
| C．over | D．with |
My uncle is a very humourous person, and he often __________ us for hours with funny stories.
| A．encourages | B．entertains |
| C．educates | D．directs |