____ is the pork?—It’s five yuan a kilo.[ ]

Shanghai Disneyland has started to be built and it will be open ________ five years. [ ]

Will you stay for some more days? —Sorry, I_____. My mother called to ask me to go back at once.

I’m ______ duty today. I must clean the classroom ______school. [ ]

My father has gone to the countryside. He’ll be back_____ three days.[ ]