We are wondering ________ we canprevent people from polluting the earth.

Everyone in the village hoped that he would ________ after a few days’ treatment.

下列各项中，字形全部正确的一项是（ ）

Excuse me, but could you please turn the radio down?—Sorry, Iyou could hear it

the widespread ________ of this medicaltechnology, more diseases can be discovered and treated at an early stage.