填空题

What should we do to stay healthy One important rule is (11) to exercise often.
The Fisher family try to exercise every day. Mr. Fisher cannot exercise in the morning because he must be (12) at his job at exactly seven o’clock. But he (13) runs every evening. He would rather run than watch TV. Walter exercises a lot too. He walks to school every day, and after school he plays (14) different sports with his friends. Mrs. Fisher goes to a yoga class (15) twice a week.
The Fishers all feel better now. And they believe you mustn’t be lazy. You don’t have to exercise every day. But you should try to get in shape and stay in shape.

How often does Mrs. Fisher go to a yoga class
Mrs. Fisher goes to a yoga class ().

【参考答案】

twice a week