问题补充：
If it is for you to go out tonight, would you like to go to the cinema with me?
A. practical
B. necessary
C. convenient
D. grateful
答案：
A. practical
B. necessary
(答案→)C. convenient
D. grateful
解析：考查形容词：A. practical实用的B. necessary必要的C. convenient方便的D. grateful感激的，句意：如果你今晚方便外出，能请你和我去看电影吗？选C。
