He stepped on a nail while he was running in the yard .

The boy's book d_____ on the ground while he was running.填空注 1.He won the first place in running ,so he was a f___ runner he was drawing something on the desk (while) i was reading a He___some French while he was away on a business trip in Par John saw a cat in a tree while he was taking photos in the g The teacher told us to c____ on with our work while he was a People caught the thief （while he was running away）.(对括号部分提问 He was busy repairing the computer ,only ____once in a while While John was walking to school ,he saw a cat in the tree 对 But while he was going across the lake in a boat,his bag fel when he was running ()the train,something He stepped onto the stage,prepared to give a lecture