good manners to say “Sorry” when you knock into someone butno need to say it again and again

Visitors are not permitted ________ the park after dark, because of the lack of lighting.[ ]

_____achievement, last week’s ministerial meeting of the WTO here earned a low though not failing grade[ ]

Looking at her _______ looks，we were _______.

My cousin went to Canada two years ago He ____there for a few months and then went to America