—_________is very interesting to swim in the river in summer, but it’s dangerous.

Is that bike        ?

 ---Dear me! What a wonderful computer! ---My grandpa bought it for my sister and me. It’s ______.

—What do you think of the movie by Zhao Wei?—Terrific. I like ______ very much.

   will it take us to fly to Hainan and       will the trip to Hainan cost us?