Do you believe drinking a glass of wine every day ______ reduce the danger of heart diseases?

Please do not feed the fish; they ________ die if they eat too much.

 Sorry I’m late. I ____ have turned off the alarm clock and gone back to sleep again. 

Who ________ a lady like Susan Boyle, once an ordinary woman in Scotland, would achieve overnight success at Britain’s Got Talent Show?

【There’s a lot of water on the ground; the water pipe _____ be repaired.