The Answer Key gives the correct answers to those exercises where each of the questions has a correct answer. But there are a number of other exercises where there is a possibility of more than one appropriate answer and these have not been covered in this Answer Key. These need discussion to decide which answers may be acceptable and which unacceptable.

In the case of some exercises, the answers can be looked up in a good dictionary. For example, the one under Grammar and Usage which requires you to decide whether a certain noun has singular and plural forms and what meanings it has in these two forms.

Under Comprehension, there are questions to which the answers can be found in the reading passage and these are not included here.