All efforts of cloning an animal will be ________ if there is not enough diversity in the group to overcome illness.
| A．in need | B．in place | C．in vain | D．in case |
The number of _____ species increases every year with their natural habitats disappearing.
| A．dangerous | B．endangered | C．serious | D．harmful |
________ of the land in that district(地区) _______ covered with trees and grass.
| A．Two fifth; is | B．Two fifth; are |
| C．Two fifths ; is | D．Two fifths; are |
－How was your final exam, Tom?
－I’m sorry, dad. I failed and only thenthe importance of studies.
| A．I realized | B．I had realized |
| C．had I realized | D．did I realize |
I stayed in Japan only a few matches,, I went through a series of hardship.
| A．during when | B．at that time |
| C．during which time | D．of which time |
–Have you heard that Tom has passed his driving test?
–Oh! That’s great of him! I’ll go and _____ him _____ that.
| A． congratulate; for | B． admire; for on |
| C． admire; on | D． congratulate; on |