It is not always easy for the public to see _____ use a new invention can be of to human life.
--You should have thanked her before you left.--I meant ________, but when I was leaving I couldn’t find her anywhere.
Many people are ________ as to what to do when there is a fire.
Girls used to take fewer advanced math courses than boys but now they are taking just _______.
If we had taken such effective measures much earlier, the river ________ so seriously now.
More and more attention has been drawn to the fact that many children are ________ in the countryside when their parents flood into the cities for jobs.