There are _____ to show that Rome will win the bid to host the 2020 Olympic Games.

The advertisements in newspapers help to cut the _____ of making the newspaper.

He’s unlucky, and he’s always suffering _____ luck one after another.

I have a ______ to talk too much when I’m nervous．

You’d better put the milk in the fridge, which has a _______ to go bad in hot weather.