I spent two hours working out this problem.(改为同义句)

I spent two hours working out this problem.(改为同义句) I spent two hours cleaning my room 改为同义句 I spent two hours on my homework.(改为同义句) She spent two hours in working it out.(同义句转换) I spent two hours on this maths problem. Tom spent two hours playing basketball yeaterday.改为同义句 He spent two hours reading the book(改为同义句) He spent two hours mending his bike .(改为同义句) I spent two hours doing my homework yesterday.(改为同义句） I spent two hours cleaning my room(改为同义句） I spent two hours in cleaning up our bedrooms改为同义句 It () me I spent two hours making the cake.(同义句转换)