—______ you please tell me something about the life in Canada? — Sorry, I______ . I don’t know either. I’m from Australia.

(2013·银川高三一模)—Where is the post office?—It's just over there, at the end of the street. You ________    not miss it.

The careless man received a ticket for speeding . He ____ have driven so fast .

The lady in the sitting room           be over sixty. She looks so young.

—Is that boy Alan?—No, it ______ be him. He left for Beijing yesterday.