What prevents people from being happy?

What prevents people from being happy? I try to understand ------that prevents so many people from being as happy as they exceptA.why it does B.what it doesC.what it isD.why it is能不能说一下为什么呢？ Can you tell me what it is that prevents him leaving home是什么从句 A peron who discourges others or prevents them from enjojing what they do. 1.When I try to find out ______that prevents so many people from taking part in the program,it seems to me that there are two main causes.A.what it is B.what it does C.why it does D.why it is2.I'd appreciate_______you could give me some advice.A.it B it's good that you know what prevents you from getting satisfactory scores in exams怎么翻译 I try to understand ____ that prevents so many Chinese from being as happy as one might expect.填 what is it 还是 what it is Some doctors suggest that vinegar will _____ people from being infected ____ H1N1.A. protect ; to B. prevents ; from C. prevent ; with D. protect ; in What people live for? what are people skills? What's up,people! 英语could you tell me__that prevents her from being as happy as before.a.what it isb.it is whatc.how it isd.it is how could you tell me (what it is)that prevents her from being as happy as before这句啥意思?为啥不howhow it is? I just don't understand __that prevents so many Americans froms being as happy as one might expect为什么用What it does i just don't understand___that prevents so many Amerians from being as happy as one might expect.为什么是What it is Many English teacher can't understand what is it that prevents students from ...Many English teacher can't understand what it is .到底是what it is 还是what is it这里? Japanese people often ask people what blood 英语翻译It requires companies to make choices about people,investments,and other resources,and it prevents them from falling into the common mission trap of asserting they will be all things to all people at times.at all times