通读下面短文，掌握其大意，然后在各题所给的A，B，C，D四个选项中，选出一个最佳答案。
OneSaturdayafternoon,asix-year-oldgirlwentforawalk.Shecrossedalargeareaofgrasslandintothewoods__36__sherealizedthatshewaslost.
Sittingonarockand__37__whattodo,shebegancrying.Afterawhile.she__38__towalkalongawidepathlinedwithtalltreesandthickbushes.__39__itwasgettingdark,shesawasmall,darkwoodenhouse.Sheopenedthedoorand__40__steppedin.Suddenly,sheheardastrangenoise,andsheranoutthedoorandbacktothe__41__.Coldandtired,shefellasleepneara__42__.
Thegirl’sparentswereoutandherdog,Laddy,wasathome.Laddy__43__thathismistresswasindanger.Hejumped__44__awindow,breakingtheglass.Helookedinthefields.Buthecouldn’tfindhismistressanywhere.However,fromthegroundcamea__45__scent(气味)asheloweredhishead.He__46__thescentandwalkedacrossthegrassland.Barking__47__intotheair,thedog__48__throughthewoodsuntilhefoundthe__49__.Butthegirlwasnotthere,soheheadedbacktothewoods.Muchtohis__50__,hesawhismistress’blueshirtinthedistance.He__51__oversomebushesandsawthelittlestream,wherethegirlwas__52__.Whensheopenedhereyesand   53   herdogstandingbesideher,thegirlsaid,“you  54  me,Laddy,”andshekissedhimseveraltimes.Seeingtheirdaughteranddogcomingback,theparentsburstintotearsof    55   .ThatnightLaddyhadahero’ssupper:ahugemealofsteak