Complete the following sentences according to the first letter given. (1)This machine is the a_________ of the modern computer. (2)The water was as s_________ as glass. (3)The city has many small lakes, natural and a_________. (4)The trade imbalance is likely to rise again in 1990. H_________ a new set of policy actions will be required soon. (5)I turned the h_________ and found the door was open.