6Let's learn & Look and write第三题答案
7Let's check & Let's wrap it up第一题答案
1—D 2—A 3—B 4—C
8Let's check & Let's wrap it up第二题答案
1.1st/first
2.third
3.eighteen
4.four
5.ninth
9Let's check & Let's wrap it up第三题答案