It has been announced that candidates ______ remain in their seats until all the papers have been collected.  

Swimming alone ____ be ____ dangerous. Do be careful.

You          read a book in the sun—it’ll do harm to your eyes.

 Without electricity human life ________ quite different today. 

It’s John’s birthday today. I wish I _____ her out to a superb restaurant for dinner, but I’m too busy recently.