The book ________ be Tom’s. Look! His name is on it.

Look at that girl! Is it Susan?—No, it _______ be her. She has gone back to her hometown.

In my mind, no such_______ thing in our country as_______ Great Wall can represent the image and culture of China．

Won’t you like to come to Li lei’s birthday party?－I will if I ______

Whose pencil box is this?—It _____ be Tom’s. It has his name on it.