The old man didn’t feel         though he stayed on the hill           ．

With more and more farmers moving to cities, an inadequate labor force is ________ becoming a major factor affecting the country's grain output.

She _______ the path as the trees around her became thicker．

 Nowadays, no single country can successfully ____ the global problems alone.

 She wanted to ask if he had news of Williams, but words ________ in her throat.