The phrase of the year 2011, "shang bu qi", ______ "too delicate to bear a blow", reveals the public's sensitivity to personal and social problems.
Tom is one of the boys who __________ on time.
__________ they will not come to join us, we have to change our plan.
That is __________ the problem lies.
__________, Carolina couldn’t get the door open.
Only after ________ his work ________ to see his grandfather.