________ in thought, he almost ran into the car in front of him.
C
这里分词短语的意义应为“Ashewaslostinthought”，意为“由于陷入沉思”，这儿填入过去分词短语，表示一种状态，用作原因状语。
According to Maslow,self-actualization need excludes _______
IntheU.K.,theQueen'sSilverJubileeisin_______.
______isrecognizedasthenationalflag-carrier.
Neither English nor Chinese ________ difficult to learn.
Hefound_______difficulttostudymaths.
