英语语法、习惯等问题Happy Canada Day!Iti s a big day that worth celebr

有一首英文歌,女声,好像是艾薇儿,开头是love,it‘s a special day we should celebr 英语语法：a four-day holiday a four day's holiday ( )Let's have a big party on Children's Day.That will be ___ happy mother\'s day Happy.mother.S Day Happy mother\'s day, Happy Teacher‘s Day! Happy Valentine's Day! HAPPY MOTHER’S DAY happy teacher's day Happy Valentine's Day Happy Children’s Day