One _____ needed when making a cake is flour; another is sugar.
.China will send its first Mars Rover, Yinghuo-1, into ______ space by ______Russian space rocket in October 2009.
.Mr. Smith owns ______ collection of coins than anyone else I have ever met.
.In order to improve my spoken English, I read ________ English _______.
._______ in the room where Mr. Johnson lived _______ the exhibition was held?
.Jerry said something strange at the meeting. His ______ left me _____ about his real purpose.