(2013·南昌三中模拟)—Do you think Jack will lend us a hand?—He is the last one to help others. He ________ lend his hand, though.

—Can we leave the classroom now?—No, you _________. You _________ to leave until the bell rings.

His work _____ have been completed; otherwise, he wouldn’t be enjoying himself on the beach.

—Look! The man at the gate ______ be our headmaster. He is always standing there every morning.—No, it ______be him. He is holding a meeting in the office now.

You ______ your coffee before it turns cold.