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Exercise Two -- KEY:

Below are the four groups (presented in no special order) and the truth values of each sentence within the groups:

Group I:  1 (F---uhh, no), 7 (T), 9 (F---as Gardner puts it in his letter to Susie West, "I'm a little insulted that ... [you] ... assume my opinions about life on earth must correspond with the opinions of a snake.")

Group II:  2 (T), 4 (T), 10 (F---as he puts it, "I came to the task of translating Beowulf with a prejudice in favour of forthright delivery.")

Group III:  3 (T), 8 (T), 12 (F---Wiglaf was the only one who stood by his master's side.)

Group IV: 5 (T), 6 (F---it is the death of Grendel), 11 (T)