A. mustn't it B. isn't itC. aren't they D. needn't they……

单项选择题Syntax is the study of______.

单项选择题One day Chuck is on a flight () the Pacific Ocean suddenly () his plane crashed.

A. through while
B. through when
C. across when
D. across while

单项选择题That she hadn't kept her () on her work resulted in the failure.

A. head
B. heart
C. brain
D. mind

单项选择题—What did Maria say — ().

A. Maria said that she likes their uniforms.
B. Maria said that she doesn't like their uniforms.
C. Maria said that she didn't like their uniforms.
D. Maria said that she was like their uniforms.

单项选择题If Newton lived today, he would be surprise by what () in science and technology.

A. had discovered
B. had been discovered
C. has discovered
D. has been discovered

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, ______