1 . __________(事实上) eating habits can vary a good deal over the centuries.

2 . ________（事实上）all languages change and develop when cultures meet and communicate with each other. （根据中文提示填空）

3 . He seems to be doing nothing,but__________(事实上)he is just waiting for the chance.(根据汉语意思完成句子)

4 . _____（事实上），China may have the largest number of English learners. （根据汉语意思填空）

5 . He seems to be doing nothing, but ______ （实际上） he is just waiting for his chance. （根据汉语意思填空）