I had just stepped out of the bathroom and was busily drying myself with a towel ______ I heard the steps.
You must come with us to the police __________ Our head is waiting for you.
The shop owner welcomed all the guests with a __________ smile.
To my ______, I passed the exam easily.
____ speaking, I didn’t do it on purpose.
It sounds like a good plan, but there are some _____ difficulties in carrying it out.