Complete the text adding suffixes, prefixes or the both to 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)_________ (known) words or try to understand the (d)___________ (context) meaning of them. Repeated reading will help you understand the (e)_________ use them in (g)_________ (i)_______ (specify) topic (f)_________ (clear) and (vary) situations. Language learning is a (h)___________ (continue) process and your (i)_________(proficient) will come today or tomorrow. What is needed most is (j)___________ (continue). It also needs your (k)__________ from (m)__________ (sincere). A common language is required for (l)___________ (interact) among people from (m)_______(differ) countries and contexts. Without a common language it is difficult to perform activities at the (n)______(nation) level. English has assumed the position of that common language.