Check Your Vocabulary

Good afternoon,my dear English learners!
Here are some words for you to improve your vocabulary:
Discernible - fain - groove - parchment - provenance - reed

1. No structure is _____.
2. The yard was so dark that even Scrooge, who knew its every stone, was _____ to grope with his hands.
3. Others move the tongue sideways, or form a _____ along the middle - an important feature of the articulation of /s/.
4. The history of graphic expression shows a variety of implements, including the use of _____, quills, brushes, steel points, fountain pens, pencils, ball-point pens, fibre - tipped pens, chalks, crayons, typewriters, laser printers, photo composing systems, and everything that modern computation makes available.
5. Many surfaces have been involved, such as animal bone, rock, clay, wax, pottery, cloth, papyrus, _____, paper, film, and electronic display screens.
6. Paleography is the investigation of ancient and medieval handwriting in order to establish the _____, date, and correct form of a text.