----Listen! Is Kitty in the next room? ---- No, it ______ be Kitty. She has gone to Beijing.
After the parade, we watched a 4-D film. It ______________ magic.
Suzy ______________ the Summer Palace with her parents the other day.
I’m not sure when ______________ the book ______________ the library.
I couldn’t get through the door because there was a big box ______________.
Miss Yao ______________ Tom two months ago.