__________is well known, light, like heat, is a form of energy.

 A.I feel sorry

B.What a shame

C.It doesn't matter

D.Do come next time

A. late enough to learn B. not late enough to learn

C. too late to learn D. no late as not learn                         

A. old enough B. as old enough C. enough old D. enough old as   

A. kind enough B. kind as to C. as kind to D. so kind as to        

A. bore B. bored C. boring D. bore some                          

A. excitement B. excited C. excitable D. exciting                    

A badly B. too badly C. too much bad D. bad                      

A. that B. which C. as D. what

A. will come B. come C. comes D. came

A. after which B. with which C. for which D. at which Part