Choose the letter A, B, C or D that best fits the blank space in the following passage.

There are many ways of spending their free (41) ______Australia. Some people are (42) ______ of skiing in Snowy Mountain or riding a surfboard to Queensland. Others enjoy watching Kangaroos and Koalas in wild forests. My sister say she only loves (43) ______ Sydney from skywalk. But I myself like going to Sydney Opera House where the great opera singers of the world can (44) ______ heard. If you are bored with listening to the opera singing, there will always be at least two (45) ______ three other shows to suit your taste.

There are many ways of spending their free (41) ______Australia.