题目内容：

The right pair of exercise shoes can do a lot to prevent discomfort, personal trainers say. Here are shopping tips:

 51   Depending on exercise types, shoes designed for walking, running  tennis and so on.

Shop when you normally exercise. Feet actually get bigger throughout  the day, sometimes swell up by nighttime.  52  

 53   Never buy a pair of shoes based only on the size of footwear you normally buy. Bring the types of socks you’d wear to exercise and go  for a walk through the store.

Talk to an expert. Shoe salesmen and personal trainers can study  your stride (步伐)and the shape of your feet. 54   

 55    Many trainers recommend taking the place of exercise shoes three to five months .

A．Think about how much you can afford to buy the exercise shoes.

B．Consider your kind of exercise.

C．Try them on.

D．Don’t shop in the morning if you often take exercise in the evening

E．Pay more attention to new style shoes.

F．Replace worn shoes regularly.

G．Usually they can recommend the best shoes to guard against injuries.