问题补充：
John was walking on air when he knew his father bought him a computer.
A. too bad
B. quite worried
C. very excited
D. a little angry
答案：
A. too bad
B. quite worried
(答案→)C. very excited
D. a little angry
解析：A. too bad太糟糕了 B. quite worried非常担心 C. very excited 非常兴奋 D. a little angry有一点点生气； walking on air得意洋洋，欢天喜地；句意：约翰当得知父亲给他买了一个电脑后非常高兴，故选C.
