— Must we finish all the exercises today? — No, you ________.You can finish them within two days.

 Jack _______ swim when he was five years old. 

–Mom, may I go swimming with my friends in the river? –No, you _________. That’s too dangerous.

We think Betty the best student. The sentence structure is ______.

No person _______ carry a mobile phone into the examination room during the national college Entrance Examinations.