用所给词的适当形式填空。

1. Look! Whose _______ (Walkman) are these? Perhaps they are the twin's.

2. Is there an _______(electric) shop in your town?

3. Amy wants to buy some presents for _______ (they).

4. Do you understand the _______(mean) of the new world?

5. Do you like to have cold _______(drink)?

结构面密集程度由裂隙度（）与切割度Xe表征。