马尔萨斯的经济理论属于（）
一个人在群体中工作不如单独一个人工作时更努力，这种现象是()。
一质点做匀变速圆周运动时，其（）
That is ______ we differ.
A person is lucky if his career ________with his interest and hobby
国家之间发生经济联系的必然性取决于()
Finding Harriets house ______ to be more difficult than Nick had expected.
They knew they had to________action to deal with the plague before it spread to other areas.
Good parents have the ability to communicate messages of love, trust, and self-worth ______their children
Out sleep influences our mood. our mood, ________,affects our performance