Chia dạng từ trong ngoặc ở dạng phù hợp

1.It’s a good idea for him _________ (learn) Cantonese.
2.Life has become (convenient) _________thanks to Internet and social network.
3.They had better ___________ (choose) more exciting music for the party.
4.If you want to volunteer, there are (end) ________opportunities for getting involved.