你写的不只一个兴趣,所以标题是My Grandpa's Hobbies
but he doesn't think lonely.=but he doesn't feel lonely.
think=想,feel=觉得/感到
Such us=Such as
Such as=例如
watering the flowers=watering plants
the flowers是指定的花 ,我想你的意思是园艺吧,所以watering plants是比较好的
listening the music=listening to music
opens the computer to watch news=switch on the computer for watching news
I'll support you forever=I'll support him forever.
二排的us应该改成we
listening the music 改为listening to the music