— Who’s that man in our classroom? It ________ be Mr. Brown. He is much taller.— You mean the man in white? He is an exchange student from England.

---Where’s Lucy? ---I’m not sure. She ________ in the school library.     

—________ you open the window, please? —Yes, I can.

Please do not feed the fish; they ________ die if they eat too much.

Harry is feeling uncomfortable.He________too much at the party last night.