请填写以下内容
1.My brother was born in ________ spring of 1990.
2．Don't lose heart. Please have ________ second try.
3. Mr Smith is ________ most learned scholar and you can turn to him for help.
4．How sweetly she sings! I have never heard ________ better voice.
5．Beijing is ________ second largest city in China.
6．My trip to Paris was really ________ unforgettable experience.
7．His mother's sudden death came to him as ________ shock.
8．This watch is ________ 18th century watch, which has been passed down from my great grandpa.
9．I think it really ________ honor for me to speak here.
10．This lab used to be in ________ charge of Mr Wang.
11．Those who are rich should help ________ poor.
12．When stealing, the thief was caught by ________ arm by a policeman.
13．In some factories workers get paid by ________ piece.
14．Teachers play ________ active and important part in building up students' character.
15．Jack has ________ good knowledge of history especially the history of the Ming Period.