Fill in the gaps in the following text by adding suffixes, prefixes or the both with the root words given in the parenthesis:

Vocabulary is very important in learning a language properly. To (a) ____ (rich) your vocabulary, you have to read books and learn new words by knowing their meanings (b) ____ (accurate). You may use a dictionary to know the (c) ____ (know) words or try to understand the (d) ____ (text) meaning of them. Repeated reading will help you understand the (e) ____ (specify) topic clearly and use them in various situations.