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

I found _____ very difficult to learn  maths  well.

—Excuse me, are these ______ new shoes?—No, they aren’t. ______ are black over there.

---What about going to the movies this weekend? ----I went to the movies last weekend, so I want to do ___ this weekend.

Roy made several kites, but _____ of them can fly high in the sky.