Is this the house______ he left at the age of 16A.at where B.which C.in which D.at which

Is there a house___? the chose the big house___(live)in the house___(be) empty for ages. The old house is not there any longer同义句 The old house___ ___ ____ there.准确点 i'm helping my mother clean the house this afternoon.对划线部分提问画线部分：helping my mother clean the house___ ___ you ___ this afternoon? Is this house ___ Sami was born in?A the one B where C which D that正确答案选A,我想问为什么house不是先行词呢?如果变成 is this the house___ Sami was born in?的话,是不是就可以用which或者that了?如果讲解的好,我一 The shop ___ (sell) not only VCD but also DVD players.The food for the guests___(prepare) already ,madam.What ___(happen) if you ___(put) a piece of ice in your mouth?Mr Green's old house___(sell).Now he is living in the country.After this rain ,the we must do house___ and keep the windows____ this is the new This is the this is the THIS IS THE WAY This is the this is the last This is the This is the this is the RT... “It is hard to keep the house___(clean) with three kids.”中应填clean,为什么要说出“keep+sb/sth+adj.”和“keep+sb/sth+doing”到底有什么区别,具体点