句子写作：Thehouse____isstillstanding.
The house which Abraham Lincoln was born is still standing.
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Ifanearthquakeoccurred，someoftheone-storeyhouses________.
句子写作：Thejudgehadahardtimedeciding___________________.
Theclothhadanaturallookwhichperfectly________theimageLaurasought.
句子写作：Thepianoplayerbegantosingloudly.
Whatarethekeyfeaturesofaresearchpaper?