Zu Chongzhi was one of the greatest mathematicians in ancient China.He was born during （1）

the

the

Northern and Southern dynasties.From a young age，Zu was （2）

taught

taught

（teach） natural science，astronomy（天文學(xué)），math and so on.The little boy was interested in all of these subjects，especially in math.
    Zu was best known （3）

for

for

his calculation（計(jì)算） of pi（π）.According to the record，he did all the work using nothing but （4）

wooden

wooden

（wood） sticks.It took him lots of time （5）

to work

to work

（work） out the value between 3.1415926 and 3.1415927.No one at that time was able to do （6）

better

better

（well） than Zu.And now the achievement is still praised by people around the world.In order to remember Zu Chongzhi，some people suggest （7）

calling

calling

（call） pi（π）"Zu Lv".
    Zu was successful not only in math，but also in astronomy.He worked out （8）

that

that

a year should be 365.24281481 days long and （9）

created

created

（ create ） the Daming Calendar .However，the government at that time did not agree with Zu.Zu Chongzhi never saw his calendar put into use.Almost ten years after his （10）

death

death

（die），the new calendar was finally accepted.