Liu Tao has never read the book The Adventure of Tom Sawyer , _________ he— _________. He told me it’s very interesting. He’d like to read it again.

When we were young, every evening my brother and I _____stay at home waiting for our mother to come back from work.

They were lost at sea at the ___________ of wind and weather.

If we ___________some measures, we might have prevented the environmental pollution．

That notebook_________ Jack’s teacher’s. Because his name is on the notebook.