The missing boys were last seen ________ near the river.
A、playingA
所填的词为主语补足语，因其后有明确的地点，补足语表示动作当时正在进行中，所以只能使用playing。
______alittleearlier,Iwouldhavecaughtthetrain.
The volleyball match was televised ________ on CCTV.
According to Maslow,self-actualization need excludes _______
In1985,_______becamethefirstinternationalhotelcompanytoopenahotelinChinabearingitsownname.
Scientistsdoubtwhetherit’s________toregulateone’sbiologicalclockbydrinking.
