欧美日韩黄网欧美日韩日B片|二区无码视频网站|欧美AAAA小视频|久久99爱视频播放|日本久久成人免费视频|性交黄色毛片特黄色性交毛片|91久久伊人日韩插穴|国产三级A片电影网站|亚州无码成人激情视频|国产又黄又粗又猛又爽的

5. Look,there is a bird on the       (樹枝) of this tree.

3. The students       (討論) the problem with their teachers yesterday.

4. We all know the       (重要性) of water.

1. The scientists are doing something to        (極救) the earth.

2. There are many kinds of       (松樹) in this park.

5. Try to eat at least one piece of        (fruit) a day.

6. Go slowly and        ( breath) slowly.

3. 我們周圍許多有用的東西都來自樹木。

Many useful things around us                    .

2. 媽媽每天都進(jìn)行打掃以保持房間干凈整潔。

Mum does the cleaning every day to                            and tidy.

1. 我們在許多方面都有同樣的想法。

We have the same ideas                    .

22. 在你的頭腦中      

23. 充滿      

19. 停止做某事      

20. 對……有用,有好處      

21. —個主要的問題      

16. 保持涼爽      

17. 有害氣體      

18. 從……中得到……