Zhengnengliang, or positive energy, _______a term used in the book Positive Energy by Richard Wiseman, has developed into a popular phrase in Chinese society where people approach life with optimism and confidence.

 He often keeps English _______ ___________,

Nowadays, a lot of children have less time to play and communicate with their peer due to extra studies. ________, it is difficult to develop their character and social skills. 

Jack had to call a taxi because the box was _______ heavy to carry all the way home.

They’re ______ choosing a cautious policy in order to avoid a risk in such an important event.