系统侵染（systemic infection）

( Mum: M  Tony: T )
T : Could I invite my friends to my birthday party on Saturday, Mum?
M: 1.____________________
T : 2.____________________
M: What for?
T : 3. ____________________
M: Well, I am shopping tomorrow. And I can buy drinks
and snacks for you.
T : Oh, good. Thank you, Mum.
M:4.____________________
T : I cleaned it last week.
M: But you need to clean it again for your party.
T : 5. ____________________
M: Then after you finish your homework, let's clean the room.