Young as he is, David has gained ______ rich experience in ______ society.

单项选择题Ellis Haizlip began his stage career in Washington D. C. , ______ supervised the Howard University Players during their summer season.

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

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

单项选择题We had a really bad time about six months ago hut now things are ______.

单项选择题______ from endless homework on weekends, the students now find their own activities, such as taking a ride together to watch the sunrise.

单项选择题Thank you for sending us ______ fresh vegetables of many kinds. You have done us ______ great service.

单项选择题I think you've got to the point ______ a change is needed, otherwise you'll fail.

单项选择题—When did it begin to snow —It started ______ the night.

单项选择题1918年出版的教育史上第一本课程理论专著，标志着课程作为专门研究领域的诞生，其作者是( )。

单项选择题教育科学研究起源于( )。