.--- Excuse me. Is this the right way to the Summer Palace? --- Sorry, I am not sure, but it _____ be .
. I could hardly tell the twins apart because their appearances are only ____ different.
He is the lawyer who you took photos ____ you were in the Forbidden City.
This picture was taken when my father was a child and even I myself couldn’t _____.
While ____ in tea with that dealer, Mr. Smith had himself ____.
Mary _____ be in London because I saw her in town just now.