| reduce | picture | educate | figure |
| produce | stupid | judicial | duty |
| conducive | student | calculate | accumulate |
| endure | genuine | curiosity | Tuesday |
| duration | induce | regular | particular |
| singular | avenue | tune | institute |
| nutriment | constitution | culinary | January |
| revenue | introduce | opportunity | manufacture |
Exercise 16
Using diacritical marks indicate the value of the vowels in the following. Try marking them without first consulting a dictionary. After you have marked them, compare your markings with those used in a dictionary.
| pupil | different | diacritical | gigantic |
| alphabet | several | radiating | gymnasium |
| natural | letter | Wyoming | system |
| result | eraser | typical | merchant |
Exercise 17
Pronounce carefully, noting that in each word at least one consonant is silent, and sometimes a vowel as well. Draw an oblique line through the silent letter or letters in each.
| through | chasten | sword | island |
| although | often | fasten | daughter |
| wrong | soften | calf | might |
| yacht | subtle | hasten | bouquet |
| gnaw | almond | naughty | honest |
| psalm | glisten | thumb | palm |
| whistle | salve | should | knack |
| salmon | chestnut | knowledge | castle |
| answer | folks | listen | thigh |
| knot | right | debt | honor |
Exercise 18
Pronounce the following, paying particular attention to the vowels. Distinguish between the meanings of the words in each group.