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 |
It was the building of the rail network from the west to the east coast ________ brought even larger numbers to California in the 1860s.
|
A．that |
B．what |
C．how |
D．which |
_______ from the top of the mountain, we found the city more beautiful.
|
A．Seen |
B．Having been seen |
C．Seeing |
D．Being seen |
Do you know the stages every inventor must ________ before they can have their invention________ .
|
A．go through; approve |
B．go through; approved |
|
C．get through; approval |
D．look through; approved |
The dodo became extinct fairly recently so its DNA is still ________ .
|
A．in good condition |
B．in good state |
|
C．in good conditions |
D．out of a condition |
If you _____ smoke, please go outside because this is a non-smoking office.
A. must B. should C. can D. may
