Counting before numbers Before the invention of written numbers，people used many different ways to count things.
   At first，people used their fingers，and even their toes. （A） _________，they could only count small numbers in this way.
   After that，they began to make small marks on sticks and bones.This helped them count bigger numbers.They used them to count things like the days of the month，（B） 食物的數(shù)量 and the number of animals they had.
   Then people （C） began to use tokens made from clay or small stones.This helped them count even bigger numbers. （D） They often put the tokens on pieces of string so that they could carry them around easily.This developed（E）_________tools like the abacus.
   （F） At last，people began to develop systems of written marks to show different numbers，and this led to the Hindu-Arabic system （0-9）.We are still using this system today.

（1）在文中（A）和（E）的空白處填入適當(dāng)?shù)膯卧~：

However

However

；

into

into

（2）將文中畫線部分（B）譯成英語：

the amount of food

the amount of food

（3）寫出文中畫線部分（C）和（F）的同義詞或近義詞：

started

started

；

Finally

Finally

（4）將文中畫線部分（D）改寫為：Tokens

were

were

often

put

put

on pieces of strings.
（5）寫出本文的中心短語：

different ways to count things

different ways to count things