——How often do I need to feed the dog?——It___food everyday, or it will be hungry.
---How many children have you got ? ---Two , _______ of them are studying in the university.
We must pay attention to _______ the teacher carefully in class.
We __________for a picnic if it ___________this Sunday.
The house ________ in1950.
The book _______ my husband bought in Shenzhen yesterday was very interesting.