21 According to the passage, how did the Brazilian students feel about going to class late?
(A) They were very ashamed of themselves.
(B) They were very unhappy about being late.
(C) They had no particular feelings about being late.
(D) They kept apologizing to their teacher.

particular的解释是：细节, 详细, 特殊的, 特别的 

briefly翻譯：短時間地, 短暫地；簡短地, 簡言地, 簡言之，一言以蔽之。

assume翻譯：認可, 假定，假設；臆斷，想當然地認為, 假裝, 冒充，冒稱；假裝， ... shuffle翻譯：走, 拖著腳走，曳足而行, （因不適、緊張或尷尬而）坐立不安，把腳動來動去

accompanied中文v. 陪伴，伴隨；伴奏（accompany的過去分詞）   strain翻譯：壓力, 壓力；拉力，張力；作用力, （肌肉等軟組織的）損傷，拉傷，扭傷, 壓力； 

palliative翻譯：治標藥物，緩解劑；治標措施，保守療法, 權宜之計；緩衝劑；消極措施。 suffocate翻譯：死, （使）窒息而死；（使）悶死, 阻止, 束縛，阻止

unbearable翻譯：無法忍受的。 undergraduate翻譯：大學本科生。

drift翻譯：（尤指在外力作用下）飄，漂流，漂移, 含義, 大意，主旨, 活動 remaining翻譯：留下的；剩餘的；其餘的。

kick off翻譯：（足球比賽）開球，開始, 生氣；吵嚷地抱怨, 死掉, （足球比賽的）開球， 開賽，中線開球,