It is fun _ on the Internet in our spare time

It is fun _ on the Internet in our spare time It's fun ___ the Internet in your spare time?A to surf B sur 单选!_____ great fun it is to surf the internet in our compute in the spare time /on the spare time哪个对? “It is something we like to do in our time just for the fun in spare time还是on spare time it is fun（）with friends on the Internet A to chat Bchating C it is fun _______music in the free time? We like traveling by car.It is fun to drive our car _ the qu bill is one of the _ (fun) boys in our class on my spare time还是in my spare time Is it the time to relax and have fun after the hard work in