Life is like the weather．Sometimes it rains but most of the time we have____ (sun)days.

People not only in China but also from many other____ (country)are influenced by Confucius(孔子).

Job said try to do things best try to do things____ (different).

-Many teens spend much time in front of____ (they)smart phones ,computers and TVs -They should cut down screen time.

-Hey,you have so many clocks in your bedroom!Are you crazy or what? -No.I am a heavy____ (sleep).I just want to make sure I can wake up on time.

用学过的词语造句。

①叮嘱

②教诲

③审视

④受用

已知平面向量a=(2,1),b=(x,-2)，若a∥b，则a+b等于(      )