【简答题】A petition has to be mailed to the Prime Minister's house in London.
【多选题】What are the involuntary muscles?
【单选题】As used in this passage, the word 'involuntary' means__________
【简答题】According to Steven Young, if scientists get the data that ______ they would petition for fast track status.
【简答题】非自愿失业(involuntary unemployment)