2 . It is often the case ________________ things may cause discomfort for people if they are not in their proper place. (用适当的词填空)

3 . ________________ matters to a museum is not how many visitors it has, but ________________ close it is to people’s daily lives. (用适当的词填空)

4 . It is uncertain ________________ side effects the new medicine will bring about. (用适当的词填空)

5 . It is certain___________being under quarantine is no fun. （用适当的词填空）

6 . ___________the flight to New York will be delayed is what I’m especially worried about. （用适当的词填空）

7 . Whether he comes________not doesn’t make any difference to me. (用适当的词填空)

8 . It is vital ________ every equipment should be checked before the experiment. (用适当的词填空)

9 . ________ the two trains crashed into each other still remains unknown, but the police say that it could be due to the heavy snow. （用适当的词填空）

10 . ________ you decide upon will not influence me, for I am not involved in your project. （用适当的词填空）