用其正确形式填空be able to,do simple jobs,have little work,help with

用其正确形式填空
be able to,do simple jobs,have little work,help with,seem possible
1.on weekend,his mother ______to do,she can cook much delicious for the whole family
2.when he was young,he _______ play the piano very well
3.could you please______the housework when your mother is very busy?
4.robots can help people_____do simple jobs,people can have more time to relax
5.it______for people to fly to the moon one day