问题补充：
Timmy often gets full marks in the exams, but he never shows off. He is very .
A. curious
B. certain
C. modest
D. practical
答案：
A. curious
B. certain
(答案→)C. modest
D. practical
解析：Timmy often gets full marks in the exams, but he never shows off. He is very modest.蒂米经常得满分的考试，但他从不炫耀。他很谦虚。故选C：谦虚的。A. curious:好奇的； 好求知的；奇妙的； 稀奇的。B. certain：某一；必然的；已确定的。D. practical：实践的，实际的；可实现的，实用的；注重实际的；可用的。
