[单选题]Mary: How do you like the idea of having a picnic this Saturday?John: Wonderful. But _____（56）?Mary: What about the Blue Mountain? It's quite cool there. John: That's a good idea. Shall we invite Michael and his girlfriend to go with us?Mary: Sure! It would _____（57）to have them with us.John: Good! _____（58）?Mary: You could biMary: You could buy some drinks and sandwiches. And some fruit, too.John: OK. _____（59）?Mary: How about 8 o'clock in the morning? It takes about two hours to get there.John: OK. I'll call Michael and tell him about our plan. We sure will _____（60）.56._____. A When shall we set off B where to C have a wonderful time D What should I take E be great fun F what could I get