This field of scientific research remains________.

—How about your travel? —You can hardly imagine what difficulty we have had ___________ the vast desert.

(2013 ·湖北荆州二模)Doctors often advise us to pay more attention to our diets and mental health and to take ________ examinations.

 I fear that I may create a bad ________by arriving late for the interview.

Everyone in the village hoped that he would ______ after a few days’ treatment.