请根据汉语提示、首字母或所给的单词，在横线上用其正确的形式填空。51.Whydidn’tyou_________（挑选）abettersubjectforyourcomposition?52.TheHarryPotterfilmsaresuch_________(令

　　请根据汉语提示、首字母或所给的单词，在横线上用其正确的形式填空。

　　51.Whydidn’tyou_________（挑选）abettersubjectforyourcomposition?

　　52.TheHarryPotterfilmsaresuch _________(令人愉快的)filmsthatchildrenallovertheworldlovethem.

　　53.My _________(最喜爱的)singerisSongZuyingwhosefolksongsIlikemost.

　　54.Theolder_________(一代人)doesn’tlikepopmusicwhiletheyounglikeitverymuch.

　　55.Thestudentsarebusyp_________fortheexamnow.

　　56.WorldEnvironmentDayisonthe _________(five)ofJune.

　　57.Whata__________(sun)day!Let’sgohiking.

　　58.Chinabecamethesecond _________(large)moviemarketintheworldbehindtheUS.

　　59.Weoftenask _________(us)howwecandomoreforourcountry.

　　60.Whatdoyouthinkisthegreatest _________(invent)ofthetwentiethcentury?