1 . Different countries have different opinions about table manners __________ (base) on different customs. (所给词的适当形式填空)

2 . It was____________ (以……为基础) more on German than the English we speak at present.

3 . You need to write a story b________ (以……为基础) on given pictures. （根据中英文提示填空）

4 . Write a story b_______（以…为基础）on what we have discussed.