a. at two. b. at about four. c. at about six. a the c. the，a. a pet pig. b. a pet cat. c. a pet dog.16. whose house did the hole lead to(通向)?a. b. c.從a、b、c、d四個選項中選出可以填入空白處的選項，b. snakes usually sleep in winter.聽第一段對話，初三英語上冊期末試卷， dead d. death，a. the，a. she