_______,we must do work on the machine.填哪个 为什么.

_______,we must do work on the machine.填哪个 为什么. (),we must do work on the machine.A for a machine to do work ( ),we must do wok on the machine A.For a machine to do wok We must _______(is) on time for the meeting. we must m___ to finish the work on time. We must finish the work on time 变被动语态 We must do _______ the Party ________ us. Children,you must do the home work( )(填反身代词) ---With the help of that machine.we can do the work with ___ We must find a person ___ (do) the work. We need five _______ (many) people to do the work. it is on the farm()we work.括号中填什么?为什么?