根据句意和语境，用所给词的适当形成填空。

1．In the game you must keep your eyes         (close)．

2．Li Hong enjoys        (swim)very much．

3．In the world, there are so many          (science)．

4．The dictionary is very        (use)for students to learn English．

5．There        (be)a saying，“No news is good news．”