Rearrange the following jumbled words and phrases to form meaningful sentences :
(a) six and eight/get their/between the/****/front incisors/ages of
(b) the gap may/when ****/on its own/go away/11 or 12/reach
(c) the canines/close the gap/the front teeth/together and/may push
(d) are/and/meant/for/food/canines/grasping/tearing