—Do you think our teacher is ________ ？

—Yes， he always corrects our homework and prepares his lessons　_______.

A. careful； careful         B. careful； carefully

C. carefully； carefully      D. carefully； careful

Look! What you’ve done! You　　 have been more careful．

　 A．should　　　 B．may　　　　 C．ought　　　　 D．would