Please pass me_________book on the right.
句意：请把右边第四本书递给我。
four四，基数词；fourth第四，序数词；the four形式错误；the fourth特指第四个。根据句意和空后book是单数形式可知，这里表示的是“第四本书”，应用序数词，序数词前必须用定冠词，故应选D。
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.
—Michael, shall we go hiking in the mountains next Sunday?
—OK, ________it rains heavily.
