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

A big earthquake occurred in Indonesia last week. Which is the closest meaning of the underlined word

Not until the stadium of Bird’s nest was completed in the end _______ back to their normal position.

Every possible means ________ to prevent the air pollution，but the sky is still not very clear.

Don’t watch TV. It’sbad for your health.