---Dad, I'm confused what I am going to do after graduation. ---You'd better first explore your talents and get to know yourself so as to find out __________ your real interests lie.
The old man has a son and two daughters, ______ treat him well, _______ made him very sad.
As they ______ their way through the desert the sun beat down upon them with more fierceness.
The children had only _______ slight temperature, but the doctor regarded the illness as serious enough for ________ hospital treatment.
— Can I help myself to something to eat? — Of course, you are ______ to, you are our guest.
People who have studied ancient instruments are hoping to learn more about the culture that ______ this ancient flute.