1 . The doctor advised that we should have a __________ (balance) diet and get into the habit of getting up early. (所给词的适当形式填空)

2 . First of all, you’d better keep a ________ (balance) diet and avoid fast food high in fat and calories. （所给词的适当形式填空）

3 . If you don’t have a _________ (balance) diet, you’re likely to fall ill owing to a lack of nutrition. (所给词的适当形式填空)

4 . Keeping a ________ (balance) diet and taking exercises regularly are considered as healthy lifestyles. （所给词的适当形式填空）