如图，在□ABCD中，AB＝3，AD＝4，∠ABC＝60°，过BC的中点E作EF⊥AB，垂足为点F，与DC的延长线相交于点H，则△DEF的面积是 .
老师们对学生们的成就感到非常骄傲．
Teachers great in their students'achievements．
越来越多的人喜欢观看《朗读者》这个节目．
More and more people the program The Reader．
Sam visits his grandfather every week？（改为一般疑问句）
Sam his grandfather every week？
Fiona didn't stay at home last Sunday．She went shopping，instead．（合并为一句）
Fiona went shopping last Sunday staying at home．
Tom has been to the US before．（改为否定句）
Tom to the US before．
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