______ around the Water Cube , we were taken to seethe Bird’s Nest for the 2008 Olympic Games.

Some doctors suggest that vinegar will ____ people from being infected ___ H1N1.

.The man to whom we handed the forms pointedout that they had not been ________ filled in.

Look! Those trees last year.

Everyone must __________ the security check (安检) before getting on the plane at the airport.— Yes. It’s necessary to ensure the passengers’ safety.