—I like number “9” best,because I think it stands for “long lasting”.
—Me too. So I chose ________ floor to live on.
句意：——我最喜欢数字“9”，因为我认为它代表“持久”。——我也是。所以我选择住在九楼。
考查数词。nine九，基数词；ninth第九，序数词；the ninth第九，the+序数词；nineteen十九，基数词。根据“floor”可知此处表示第九层，用序数词ninth表顺序，其前加定冠词the。故选C。
—I like number “9” best,because I think it stands for “long lasting”.
—Me too. So I chose ________ floor to live on.
Please pass me_________book on the right.
— What did the teachersay?
—He told us to go over__________lessons.
Jack is going to be anolder brother. His parents are planning to have their________child.
The new bridge is________ metres long.
—What's the key to success, Dad?
—More time and hard work, ________ you'll make it one day.
Alice can sing some English songs, _______ she can’t play the guitar.
You must make sure your mask (口罩) is clean ________ you put it on.
_________he was poor himself, he tried his best to help the people in need.
______you smile at others, they will smile back.
