I have battled with my _______ whether I should keep the extra money given to me or return it to the seller.
The soldier stood there ___ , except that his lips moved a little as if he was saying to himself.
---I went to the History Museum last summer. ----Did you go ___?
He is ill, and he has ___ in bed for a week.
We’ve made up our mind to finish this experiment no matter ___ difficult it was.
His doctor suggested he ___ smoke because of his illness.