Timmy often gets full marks in the exams, but he never shows off. He is very ___.
A.curious
B.certain
C.modest
D.practical
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C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。