Happiness and success often come to those who are good at recognizing their own     .

 Each member country of WTO must ________ its laws and regulations and compete on the principle of fairness and cooperation.

 The jewels that the rich lady was wearing that evening must be ______.

As we       the big crowd, I got       from my family.

With the word “ PM2.5” ________ appearing in media reports, people pay greater attention to it and seek health tips for smoggy days.