Many people keep dogs as pets because dogs are regarded as（）friends to people.

单项选择题No sooner had we reached the top of the mountain ______ we all sat down to rest.

单项选择题He is only too ready to help others, seldom,（）, refusing them when they turn to him.

A.if never
B.if ever
C.if not
D.if any

单项选择题（）the temperature might drop, coal was prepared for warming.

A. To consider
B. Considered
C. Considering
D. To be considered

单项选择题—Will you be able to finish the job this week —______.

单项选择题—（） —I'm suffering from a stomachache.

A. Are you feeling better
B. What's trouble with you
C. Is there wrong with you
D. What's the matter with you

单项选择题—Was it not until last week（）he decided to give up smoking —No. He began（）he saw the news film last month.

A. when as soon
B. that immediately
C. did that
D. that till

单项选择题______ that Mr. Thomson got such rare fishes

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

单项选择题After a long discussion, they ______ an agreement.

单项选择题学生活动与交往的基本场所是( )。