A．recycled B．about C．reused D．holiday E．cheapest F．if G．vacation H．fastest I．whether J．of

76．The 　 　/ 　 　way to get there is by coach？

77．My family went to Hainan on 　 　/ 　 　last year．

78．At green school，every class collects waste which can be 　 　/ 　 　．

79．What do you think 　 　/ 　 　my new shoes？

80．Could you tell me 　 　/ 　 　you're going to come？