一、根据提示，用画线单词的同类词填空，使句子完整通顺
1. The cheetah(猎豹)is the world's fastest animal. They are great runners. Penguins can swim fast. They are good .
2. Too much sugar is bad for our teeth. There are too people in the park today. It's really crowded.
3. Math is interesting，so I am in it.
4. People cut down some trees to make a boat. Lucy picks some beautiful fallen leaves.
5. Penguins are a kind of bird，although they can't fly like other birds. My pet dog is of my family. We all love it.

一、1. swimmers 2. many 3. interested 4. up 5. part

二、根据汉语意思完成句子，每空一词
6. 砍倒这棵树让松鼠一家失去了它们的家。 this tree made the squirrel family lose their home.
7. 真正的朋友应该尊重彼此的习惯。 True friends should respect habits.
8. 用骑车代替开车上班有助于保护我们的环境。 Riding to work instead of driving our environment.
9. 人们不应为老虎美丽的皮毛而杀害它们。 People shouldn't tigers their beautiful fur.
10. 这对双胞胎在有些方面看起来不同。 The twins look different .
11. 在我看来，他根本不喜欢交朋友。 In my opinion，he like making friends .
12. 如果你在森林中迷路，你将处于极大的危险之中。 If you get lost in the forest，you will be .
13. 每当孩子摔倒，父亲总轻轻地抱起他，并把他抱回家。 When the child falls down，the father always gently and him home.
14. 传统中医是中国文化的重要组成部分。 Traditional Chinese medicine is Chinese culture.
15. 四叶草被视为一个好运的象征，能给发现它的人带来希望和正能量。 The four-leaf clover is often considered as ，bringing hope and positive energy to those who find it.

二、6. Cutting down 7. each other's 8. helps save 9. kill,for 10. in some ways
11. doesn't, at all 12. in great danger 13. picks him up,carries
14. an important part of 15. a symbol of good luck