根据括号里所给的汉语写出英语单词。

1.Try to____ （步行)or ride a bike when you travel a short distance.

2.Chinese people usually eat ____  (月饼) on Mid-autumn Day.

3.It isn't ____  (容易的) to learn English well.

4.Do you want to____ (制作) cards by hand for your teachers on Teachers' Day?

5.Cars pollute the ____ (空气)，so remember: Use your legs

看图，根据字母提示，重新组合单词 。

____

如图所示，将长方形ABCD的纸片沿EF折叠，点D、C分别落在点D′、C′处，若∠AED′=50°，则∠EFB的度数为____．

可在同一细胞中产生的生命现象或物质是 （   ）