根据中文及句意，完成句子。
Who do you think is the greatest person __________(活着的)?
I saw Jim run away in the __________(方向) of the post office.
He ________(意识到) the importance of study and asked his teacher for some help.
--Have you ever been _________(国外) for holiday? –Never.
--When did they ________(返回) home from Japan? –Last Saturday.