--- Whose comic book is it? --- It ________ be Daniel’s. He often shares his comic books with his friends.
The bird’s singing came into our room _____ the window and woke me up in the early morning.
_____ he is not very rich, he often gives his food and clothes to the poor people.
I think _____ is more important than money. Let’s exercise every day.
I saw _____ eighty-year-old man with an umbrella on such a sunny day just now.
—Is Mary sure _______ the exam? —I think so. She is good at math. I’m sure ______ she can pass it.