North Europe __________ Norway, Sweden, Denmark, Finland and Iceland.
After the bell rings,which indicates the ending of the exam,you_____stay where you are until all your papers are collected.
—You were not listening;what troubled you? —I my coming math exam.
I am amazed at someone so rich _____ difficulty in paying what he owes you.
It doesn’t matter how much loss we have suffered; just avoid _____ the mistake again.
Just as sound travels through the air in waves, electricity travels through the air in ______ radio waves.