________is dangerous for us to swim in the river alone.

— You have never seen the dinosaur eggs, have you?—________. How I wish to visit the Dinosaur World.

----What _____ your cousin ______?   ---- She is a bit thin with long black hair.

—You’ve never seen such a wonderful film before，_______？—No，I haven’t．

—You haven’t been to the West Lake, have you?—____. But I will go there with my parents this summer vacation.