1- The word tephra, from the Greek word meaning ash, has come into use among geologists to describe the assortment of fragments, ranging from blocks of material to dust , …….. ejected into the air during a volcanic eruption. 1) are 2) that is 3) being 4) which are 2- The growth of commerce had brought Spaniards into contact with other societies that had ......... and stimulating literary traditions. 1) originally developed 2) been developing originally 3) developed original 4) originality developed in question 1, the answer is 2, but why isn't it 4? And in question 2, the answer is 3, and in this case, I think parallel structures are not being followed.