—Do you like working as a waiter? —Yes, but I get tired ______ standing the whole day.
The children ran away from the orchard(果园)________ they saw the guard.
In China, the education is divided into three _______: basic education, higher education and adult education.
By the time he was twelve, Edison _______ to make a living by himself.
The two sportsmen congratulated each other _______ winning the match by shaking hands.
Information has been put forward _______ more middle school graduates will be admitted into universities.