Themissingboyswerelastseen________neartheriver.
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 。
________inthought,healmostranintothecarinfrontofhim.
Motivation and personality may ________ the varying d egrees of success in one ’s career.
In 1985,_______ became the first international hotel company to open a hotel in China bearing its own name.
Poor speaker of English though he was at the time, he still managed to make himself ________.
In 1995,an average of _______ of domestic travelers went on sightseeing in China.
