Listen and circle the words you hear.（10%） 听句子，圈出听到的单词。
（1）law lawyer low
（2）Bobby pop puppy
（3）design designer dentist
（4）ball fell fall
（5）swim swimming swam
（6）cooking cook cooker
（7）fishing skating shopping
（8）hats caps helmets
（9）safety save safe
（10）policeman police policewoman