When a lion asleep,a little mouse began running up and down

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When a lion asleep,a little mouse began running up and down beside him,__________made some noise.
我填了it为什么错了,请问应该填什么,为什么填

首先不能填 and 如果有and him 后面就无需逗号,填it 为什么不对呢,因为前面已经有主语了-a mouse ,而且这句话还没说完中间再插一个主语岂不是很累赘?
可以填 meanwhile ,一头狮子睡觉觉的时候,一直小老鼠在他身边跑来跑去（同时)还弄出声响

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