Study the vocabulary, phrases and grammar theory of mission 7 and 8 and their exercises.
Vocabulary Mission 7 and 8: pp. 247, 248, 249
Phrases: 2 (p. 256), 13 (p. 258), 20 and 21 (p. 260)
Grammar: 9 Modal verbs (pp. 272, 273),14 Relative pronouns (pp. 277, 278), 17 Adverbs (pp. 280, 281), 24 If-sentences (p. 287).