Some 1,000 new words or usages join the English language each year. Some go into the dictionary. Others _______ from use.
There are so many books!It is not easy for us to decide what to take and what to______.
A model or an experiment in a science class can help students see things which would ______ remain hidden.
How to balance the government's budget without raising taxes is a ______problem.
On your way to New York William will keep you ______if you don't want to be lonely.
Don't ______.You will ______ new customs and different ways of thinking.