Jack is going to be anolder brother. His parents are planning to have their________child.
句意：杰克将成为一个哥哥。他的父母正计划要第二个孩子。
考查序数词辨析。one一个，基数词；first第一，序数词；second第二，序数词。根据“Jack is going to bean older brother”可知，他要成为一个哥哥了，说明父母准备要第二个孩子，用序数词表顺序，故选C。
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.
The young men all shouted “Happy New Year” _______it was twelve o’clock.
You’d better tidy up your room ________ your father comes back.
