(1)Using a dictionary can occasionally be an exercise in frustration.(2)When, for example, you can't spell a word.

(3)How do you look up the correct spelling?(4)It is just as exasperating when you discover the definition of
"evocation"is"the act or fact of evoking".(5)You think using a dictionary is hard,imagine how difficult it was to compile the first dictionary of English.(6)In fact,its creation represents a remarkable achievement in the history of the English language.
(7)No adequate dictionary of the entire English language exists until the middle of the eighteenth century.(8)In 1746 Dr Samuel Johnson took on the challenge.(9)Five London booksellers signed a contract with the little-known Dr.Johnson to compile a dictionary.(10)He hoped to complete the dictionary in three years.(11)Dr.Johnson wrote the definitions himself,but he employed six part-time secretaries to copy illustrative quotations.(12)This first English dictionary,published in two volumes, contain 43,500 words.(13)Today the English language has twenty times as many words, often with different levels of meaning, thus making a good dictionary a necessity.

Sentence 7:No adequate dictionary of the entire English language exists until the middle of the eighteenth century.

What correction should be made to this sentence?

1.change the spelling of adequate to adequit
2. change exists to existed
3. insert a comma after exists
4. replace until with since
5. change eighteenth century to 1700s

2 ?

Right

thanks ;-)

Yes, the correction that should be made to sentence 7 is to change "exists" to "existed". The corrected sentence would be: "No adequate dictionary of the entire English language existed until the middle of the eighteenth century."