A. had discoveredB. had been discoveredC. has discovere……

单项选择题With the shining water before you and the wind, ______ trees behind you, you can not help ______.

单项选择题—Did your sister pass the exam —She failed and is in low spirits. —Im sorry for her. —().

A. Thank you
B. You're welcome
C. I would think so
D. Never mind

单项选择题Many people keep dogs as pets because dogs are regarded as () friends to people.

A. lonely
B. only
C. loyal
D. fair

单项选择题He must be helping the old man to water the flowers,______

单项选择题It's impossible for a child to do so much work within a short period of time, ______