The heavy work _______ ( affect ) his health, so he looked much older.
The teacher told him                (not sleep) in class.
He used _______ (get) up late, but now he is used to getting up early.
__________ (take) a walk after supper is good for our health.
He is feeling tired now because he  __________(interview) five people today .
__________（improve）his English， he often practices hard.