— Can I pay the bill by check?—Sorry, sir. But it is the management rule of our hotel that payment _______ be made in cash.

— Peter was admitted to a second－class college.— He ________ a top university, but he was addicted to playing computer games.

― Why ______ you stay in the countryside, where it’s not convenient to go shopping?―But I’ve found it rather valuable for my health.

--- Whose comic book is it?  --- It ________ be Daniel’s. He often shares his comic books with his friends.

We________finish it ahead of time, though it was such a tough task.