Vocabulary Check

Good evening,my dear English learners! I hope you are fine and save. It's time to work on your vocabulary.Enjoy!!!)))
arduous - discernible - elocution - etch - lustre - peruse

1. No structure is ______.
2. Being a commercial traveller is  _____ but without travelling I couldn't earn my living.
3. And also to an act entitled an act for the encouragement of learning, by securing the copies of maps, charts, and books, to the authors and proprietors of such copies, during the times there is mentioned; and extending the benefits, thereof to the arts of designing, engraving, end _____ historical and other prints.
4. Many of these selections are taken from the most elegant and classical American authors - writers whose noble productions have already shed and unfading _____, and stamped immortality upon the literature of our country.
5. After a careful ______ of this work, we are decidedly of opinion, that it is the only successful attempt of the kind.
6. No school should be without this book, and it ought to find a place in the library of every gentleman who values the attainment of a just and forcible _____.