Experts believe ______ people can waste less food by shopping only when it is necessary.
My parents have always been _________ travelling whenever they get the chance.
---Do you mind if I open the window?--- I feel a bit cold.
While the dog, you should take care not to Otherwise, it may be dangerous to strangers.
From the _____ look on his face, we know he is _____.
He asked the boy where .