---Look at the boy running on the playground. Is it David? ---It ______ be him. I saw him go to the teachers’ office just now.
The Eiffel Tower __________ for the 1889 Paris Expo. It is a symbol of the city now.
Could you please tell me ___________?
---How far is your home to your school? ---It _________ me about twenty minutes by bus.
---Where is your father? ---He isn’t here. He __________ Yushu to help the people in trouble.
---I will go to Guangzhou this summer vacation. ---__________.