1) Mathematics... us with many aspects. 2)The United States...of about 160 nations. 3)Coffee contains ceffenie,and... 4) Plenty of milk...consumed everyday 5)Neither you nor I...responsible for the bad result. 6) I can not speak Spanish.-... 7) Both Jane and Mary,as well as John,....ready for the exam 8) Working for 12 hours a day in a week...seven 9) What he told you ... to be of no importance 10) The quality of these recordings...not very good. 11) ...Julia...her sister are going to the party 12)My wife had never been to Hue,and...I 13) plants and animals in high mountain areas...with freezing temperatures,fierce winds,and thin air. 14) Tom's family... wondering whether there... anything that they can do 15) the couple... in Denver but..to Houston for the winters 16)Each nation...its own culture,and our nation has...own culture,too