Though the policemen got after looking for the murderer in the city for a whole day, they felt excited when finding an knife by the lake.
I don't think the experiment is ___ failure, because it has provided us with ___valuable experience for our future tests.
As is known to us all, under no circumstances______ temporary economic development at the expense of the environment and resources.
We don’t care if a hunting dog smells _____, but we really don’t want him to smell ____.
The present question is ____ many students consider it impossible ____ is really possible if effort is made.
Some very common things such asto the sun for a long time will do harm to people's skin and even cause skin cancer