根据中文意思完成句子。
我学英语已经有5年了     I_________________ English for five years.
在保护动物方面还有很长的路要走。
This is still _______________ to go to save the animals.
他妈妈生病了，他得在家照顾她。
His mother is ill, he has to ____________ her mother at home
我们究竟能做什么？      What ___________________ can we do?
他在世界各地举办过音乐会。 He has given concerts ________________ the world.