After several years of observation, the research group ______ the conclusion that language acquisition is faster when students ______ to the situation where it is spoken.
|
A．has come to; expose |
B．have arrived at; are exposed |
|
C．has concluded; are exposed |
D．have reached; expose |
It will be many years ______the doctors and medical scientists can find _____ for cancer.
|
A．since; cures |
B．when; treatments |
C．before; cures |
D．until; treatments |
We have to ______ everything question in detail ______ we take action.
A. conclude; before B. make analysis of; when C. expose; until D. analyze; before
It is clear that no use can be made ______radium _____we don’t know clearly the characteristics of it.
|
A．from; if |
B．of; unless |
C．from; unless |
D．of; if |
From my point of view, the theory that ______ by the scientist is not quite scientific.
|
A．was risen |
B．brought up |
C．had been raised |
D．was put forward |
The invention of steam engine greatly sped up the industrial revolution, which _____ a lot to the take-off of the world.
|
A．led |
B．contributed |
C．constructed |
D．exposed |
