Fill in the blanks with the proper forms of the given words. 1). The doctor told Penny that too much _________ to the sun is bad for the skin. (expose) 2). We must look beyond illusions and ___________ and try to discover what is missing. (assume) 3). He devotes his time to the __________ of knowledge. (acquire) 4). We must ensure __________ of fuel supplies. (continue) 5). The European Union countries were once worried that they would not have ___________supplies of petroleum. (suffice)