这些问题展示了战略规划的重要性。

These problems ___demonstrate the importance of strategic planning.

这些数字清楚地表明了该国面临的经济问题的规模。

These figures clearly ___demonstrate the size of the economic problem facing the country.

研究已经证明婴儿在出生后很快就能识别母亲的声音。

Research has ___demonstrated that babies can recognize their mother's voice very soon after birth.