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What is he going to plant?  

I think he is going to plant some flowers.

What should a person do to make his garden look nice?

He should  use some pots to keep things neat and to reuse some old things (tires, doors, rubber boots) in a beautiful way.

Does he enjoy his hobby? Why?

I think he does, because he looks like a person who is keen about his hobby and he does everything with care and love.

Do you like gardening? Why? Why not?

I like gardening because its interesting and relaxing. / I dont like gardening because its not my cup of tea!