1 . The little boy was declared by the hospital as small but __________ (energy), and the 2-year-old was able to walk again, assisted by a walker. (所给词的适当形式填空)

2 . He knew I was _________ (energy) and dynamic (充满活力的) and would get things down. (所给词的适当形式填空)

3 . My son is lively and ______(energy), but sometimes he is impatient. (用所给词的适当形式填空)

4 . Keeping a proper balance between study and rest keeps us________ (energy). （所给词的适当形式填空）