--- Talking of travel, have you ever been to Chicago?--- Yes. I _____ it twice while I was working in the US.
What do the five rings on the Olympic flag ___________?
Visitors were _______ at the ________pictures that the guide showed.
I can never forget the day ________ we worked together and the day ________ we spent together.
Is this the reason _______ he was late for the meeting?
I have many friends, _______some are businessmen..