一、单词辨音下列各组单词中有三个单词的元音读音相同，只有一个单词例外。要求在读音不同的单词下面划一横线。（本题共5分，每小题0.5分。）
例：reach heat leave head
1.form word born torn
2.foot good flood look
3.walk talk chalk calm
4.five give dive drive
5.watch match catch snatch
6.few new knew sew
7.house south soul mouth
8.wall shall fall call
9.none chose note close
10.grown known thrown town
