During the summer holiday season there are no（）rooms in this seaside hotel.

单项选择题He will have to（）his indecent behavior one day.

A. answer to
B. answer for
C. answer back
D. answer about

单项选择题At four thousand feet, wide plains begin to appear, and there is never a moment when some distant mountain is not（）

A. on view
B. at a glance
C. on the scene
D. in sight