Unit 1 In the library

Unit 2 Water sports

Unit 3 Make our world more beautiful

Unit 4 Travel

Unit 5 Have a good time

Unit 6 Mainly revision

Unit 7 A man who never gave up

Unit 8 Merry Christmas!

Unit 9 What is it made of?

Unit 10 When was it built?

Unit 11 Planting trees

Unit 12 Mainly revision

Unit 13 The world s population

Unit 14 Shopping

Unit 15 A doctor for animals

Unit 16 The football match

Unit 17 The missing necklace

Unit 18 Mainly revision

参考答案