I hear someone _______at the door. Please go and see who _______ is.

What was _____ made disabled Marty keep on trying repeatedly? — His desire to make a difference. [ ]

s a difficult and stressfuljob, but one ______ you can really help people.

It is _______ outside. Let’s put on our raincoats and go out, Tom.

对下列划横线词的解释有误的一项是（　　）