用所给单词的正确形式填空
1. I can't imagine ________(live) on Mars for so long a time.
2．I had meant ________(call) my parents last week, but I was too busy.
3．It is little good ________(stay) up so late every day.
4．The adventurer managed ________(hold) on until the rescuers arrived.
5．It is considered safe ________(leave) the children in her care.
