1、Unit 4 Astronomy: the science of the stars,learning about language,Answer key for exercise 1:,presence,violence,confidence,difference,patience,uncertain,unfair,unpaid,unlike,unkind,Discovering useful 。

2、Unit 1 Festivals around the world Checking answer I 2mAnswer keys for Ex.1 on Page 4: religionreligious dangerdangerous 。

3、Unit 3 The Million Pound Bank Note GrammarNoun clauses as the object and predicative 名詞性從句 賓語從句 表語從句 名詞性從句相當于名詞，可分別作主句的主。

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