Nowadays, many people walk to work ____CopenhagenConference calling for living a low-carbon lifestyle to cope with globalwarming.

下列各句中，加点的成语使用恰当的一项是（ ）

It is ordered that a new bridge ______ over the wide river.

He was told that it would be at least three more months _______he could recover and return to work.

hool plans a wide ofoutings, such as performances, picnics, swimming and museum trips