Here are the answers:
* 1 What about making a fruit cake? - e OK. We need to buy some flour.
* 2 Shall we take a picnic? - f Good idea. I'll make some sandwiches.
* 3 What about going to the toy shop? - b I don't want to. I haven't got any money.
* 4 Shall we go cycling? - a OK. I've got my bike.
* 5 What about having a water pistol fight? - c No, thanks. I don't want to get wet.
* 6 Shall we play Hide and Seek? - d OK. You start counting and we'll hide.