Unit 1 We should wash our hands with soap and water. Unit 2 I could help to train dogs at Animal Helpers. Unit 3 Could you please lend me some money? Unit 4 Why don’t you write her a letter? Unit 5 What was he doing? Units 1~5 综合练习 Unit 6 Unless the prince marries you, you will turn into foam. Unit 7 What animal lives the longest? Unit 8 Have you heard of the “King of Pop” yet? Unit 9 Have you ever been to Happy Valley? Unit 10 How long have you owned it? Units 6~10 综合练习