China has in producing clones of cows and goats, and continues to research ways _______ can benefit mankind.
| A．resulted ; that | B．succeeded ; / |
| C．succeeded ; that | D．resulted ; in which |
We will wait for further information, you should keep us ________.
| A．heard | B．informed | C．realized | D．recognized |
These houses are sold at such a low price _______ people expected.
| A．as | B．like | C．that | D．which |
She _______ me ______ her parents as I met them for the first time.
| A．showed; to | B．drove; to | C．brought; to | D．introduced; to |
Only by hard working can you _______ the goal.
| A．achieve | B．receive | C．make | D．take |
This kind of exercise is most _______, and therefore is a good test of your students’ ability.
| A．surprising | B．encouraging | C．exciting | D．challenging |