Three.

95. _What are they?_
Vowels, Consonants, and Combinations.

96. _What letters are never silent?_
F, J, Q, R, and X.

97. _In what words is V silent?_
Sevennight and twelvemonth.

98. _In what word is Z silent?_
Rendezvous.

99. _What letters are never doubled?_
X and H.

100. _How many words contain all the vowels in regular order?_
Two.

101. _What are they?_
Abstemious and Facetious.

102. _What is a Diphthong?_
Two vowels sounded together in the same syllable.

103. _Name the Diphthongs._
Ou, Ow, Oi, and Oy.

104. _How many sounds do they represent?_