While there are quite a few differences in the education system, in many countries education is ____.

Our research has focused on a drug which is so _____ as to be able to change brain chemistry. 

Much to his surprise, he invited only twenty friends to the dinner, but ______ came.

It is known to us all E-mail is______ efficient than sending a fax. 

It has been decided that this company has the _____ right to print Mr. Smith's novels.