1、Unit 1 Festivals around the world,Learning about language,Checking answer I (2m)Answer keys for Ex.1 on Page 4:,Checking answer II (2m)Answer keys for Ex.2 on Page 4:,Many people think that Christmas。

2、Unit 5 CanadaThe True North Learning about language Meaning for multi wordsmulticulturalmulticoloredmultinationalmultime。

3、Unit 4 Astronomy: the science of the stars A time machine Big Bang a solid globeatmosphere water It became very violentI。