The population of Africa is __________ so rapidly as to cause great concern of the whole world.
| A．expanding | B．stretching | C．extending | D．spreading |
He was _____ by a bee when he was collecting the honey.
| A．scratched | B．pricked | C．stung | D．bitten |
A landing on Mars is within the _____ of current physical theory.
| A．scheme | B．scope | C．scrap | D．scale |
You will get to the church more quickly if you take this _____ across the fields.
| A．track | B．passage | C．method | D．journey |
He gave me some very _____ advice on buying a house.
| A．precious | B．worthy | C．precise | D．valuable |
The writer was always looking for suitable _____ to use in his next story.
| A．contents | B．articles | C．notions | D．ideas |