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1. thin [θin] think [θiŋk]thought [θɔ:t] throw [θrəu] thank [θæŋk]thaw [θɔ:]three [θri:] thrill [θril] through [θru:]
theme [θi:m]third [θə:d]thief [θi:f]
2. panther ['pænθə] author ['ɔ:θə] something ['sʌmθiŋ]
wealthy ['welθi]healthy ['helθi] northwest ['nɔ:θ'west]
3. south [sauθ] growth [grəuθ] truth [tru:θ] month [mʌnθ]birth [bə:θ] breath [breθ] mouth [mauθ] bath [ba:θ] death [deθ]
fifth [fifθ]
句子练习训练： 1.Three things 2.Nothing is worth thousands of deaths. 3.He threw three free throws. 4.Elizabeth's birthday is on the third Thursday of this month.
1)sin [sin] sink [siŋk]sought [sɔ:t] south [sauθ] sow [sau]sank [sæŋk]saw [sɔ:]see [si:] grows [grəus]trust [trʌst]
sick [sik]soup [su:p]
2）sudden ['sʌdən]sunny ['sʌni] sander ['sændə] senser ['sensə] sixty ['siksti] sister ['sistə]surface ['sə:fis] server ['sə:və]
surgery ['sə:dʒəri] thesis ['θi:sis] ['θi:səs]
句子练习训练： 1.Six sick sea-serpents swam the seven seas. 2.I see six students print their thesis themselves. 3.The power surge suddenly killed the server. 4.The soup sank down in the sink.
对话练习： A: When’s Mathews’ birthday? B: I think it’s on Thursday. A: Thursday, the third of the month? B: No, it’s the thirteenth. A: How old will he be? B: I think he’ll be thirty-three. A: Thirty-three? I thought he was younger than that. B: Well, he might be thirty-two. A: Thanks. I don’t think you know anything for sure.
绕口令： 1.I thought a thought. But the thought I thought wasn't the thought I thought I thought. If the thought I thought I thought had been the thought I thought, I wouldn't have thought so much. 2.I saw a saw saw a saw. | 
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