Jane has studied these animals for many years and helped people understand how much they behave like humans．

His whole life has been devoted to studying the origin of cancer．

He has devoted himself to teaching since he graduated from the college in 1962．

The miners are campaigning for better working conditions．

The city hall is planning to start a campaign against smoking．

The patient with Bird Flu was in such dangerous condition that the doctors and nurses had to look after him day and night．

Maurice has achieved his hope of becoming a doctor．

Jane has achieved everything she wanted to．

They are faced with the problem whether they should continue the work．

The question who should do the work requires consideration．