The best way to explore _______ countryside is on _______foot.
You must be a student, ________you?
We all agreed to her suggestion that we______to the Great Wall for sightseeing(观光 ).
There was a half smile on his face which suggested that he____happy to have given his life for his country.
____the fog, we should have reached our school.
He had an expression of resentment(不高兴), as if Martin___a fool of him.