.Many people didn’t realize the importance of health _______they have fallen ill.
This is the best film I have _______ seen.
—I’m sorry I _______my homework at home..—That’s all right. Don’t forget _______it to school this afternoon.
—Where is Li Mei now? —She _________ to Canada. She will be back in two days.
I _______ the dinner already.
The picture shows us ________ in Nanjing in the past.