In the distant past, friends relied on each other for their survival. They hunted together and defended each other against ____________(danger) animals and enemies. In those days, if you didn’t have a friend ,you would either starve, be eaten____________ killed. Nowadays, friendship isn’t _____________(exact)a matter of life and death .However. friendship is still of great importance and not having a friend is something to be ____________(concern ) about. Most people look upon a friend as someone they can depend when they are going ______________ times of  trouble .In such times, friends provide them with emotional support and sometimes financial help. It is in these troubled times ____________they find out who their true friends are. As an old saying _________________(go),in times of prosperity, friends will be plenty: in times of _______________(suffer), not one in twenty. And there is another saying ____________ says you can hardly make a friend in a year, but you can easily upside one in an hour. So do your best to get along with and be grateful to all those _______________ are willing to side with you even when you are in the wrong as they are true friends and they are not easily come by.