One day a group of friends climbed mountains．The snow went on falling and they could see only a few meters in front of    . “We should go back.” Said Judy．She was afraid．“But where is the path? Everything was    with snow．The sky was grey．“What’s the     ?” asked Paul．Judy looked at her watch．“Nearly 5 o’clock．It will get     in an hour. “We must continue walking and hope we find the   . I think the snow’s stopping．” said Paul．But it wasn’t stopping．The wind was strong．It   around them cold and wet．“Just keep going downhill.” Said Judy．“We can’t go wrong．Then Paul fell on some rocks．He shouted. “Judy! I’ve hurt my leg.”  He couldn’t stand up. His leg hurt too much．“I’ll have to phone for help.” said Judy, “I hope the mobile phone works up here!” Luckily, it    ．They phoned the mountain service．“Don’t move．Stay  you are．We are sending a team there.” shouted the man     the phone．They were not far from the path. So the team found them    ．They were lucky! People often get into trouble when they climb mountains．You must always tell someone where you are going and take a mobile phone with you．