In a new study of African elephants，researchers have four distinct characters that are among a group.
| A．convinced | B．identified | C．differed | D．existed |
________they visited the Science Museum，they showed great interest in everything they saw.
| A．The first time | B．For the first time |
| C．At first | D．At the first time |
It is reported that a woman as well as two children ______ from a big fire yesterday.
| A．was saved | B．were saved |
| C．had been saved | D．have been saved |
We laugh at jokes, but seldom _____ about how they work.
| A．we think | B．think we |
| C．we do think | D．do we think |
— Mum why do we eat much vegetable
— Because it is ________ to our health.
| A．benefit | B．benefited |
| C．beneficial | D．benefits |
—Tommy，do the dishes.
—Mum，it’s a girl’s job. I would rather ________the floor.
| A．to sweep | B．sweep |
| C．sweeping | D．swept |