短文填词more than one hundred years ago there was a great french

短文填词
more than one hundred years ago there was a great french scientist called ampere（安培）.
one day ampere w___ in the street.there were a lot of people and much treffic.he had no p____ with him.how could he work it out?
then he saw a b__ in front of him.he quickly walkup to it. he t___ out a piece of chalk and w____ his problem on ehe blackboard.then he started to work on it.the blackboard moved a little,but he did not notice.the blackboard m___ on and ampere walked after it.then hr started to run .at last he stopped to have a l____.