P50 17-1 I. sh发/S/的单词 I. sh发/S/的单词 P51 17-2 II. gh不发音或发/f/的单词 II. gh不发音或发/f/的单词 P51 17-3 III. 奇想法 III. 奇想法 P52 17-4 I. Listen and tick (√) or cross (×). I. Listen and tick (√) or cross (×).