May 10，2017 was marked as ________ first Chinese Brands Day（中国品牌日）． "Made in China" has come of age．（　　）

A．aB．anC．theD．不填

The young mother won't leave her baby _______ she is sure that he has already been asleep．（　　）

A．unlessB．becauseC．ifD．since

Do you enjoy the songs sung by Jay Chou？

Of course．Not only I but also my parents ______his fans．（　　）

A．amB．areC．wasD．were

Which of the following words is pronounced /raiz/ ？（　　）

A．raceB．rideC．roseD．rise

China's first home﹣built aircraft carrier（航空母舰） hit the water in Dalian _______ the morning of April 26， 2017．（　　）

A．inB．onC．atD．to