subject verb agreement

Directions: Select the correct form of the verb in the sentence. 1.  Some people  is/are/am  very good at math. 2.  Somebody   have/has    the winning lottery ticket. 3.  The doctor who has visited dozens of countries and has helped thousands of patients all around the world   is/are/am   over there. 4.  There   is/are/am   two sides to every argument. 5.  5,280 feet   is/are/am   a mile. 6.  Jill as well as Jack   is/are/am   up the hill. 7.  Either Heather or I   go/goes  . 8.  A:  There   is/are/am   a lot of people here.      B:  Yeah.  Everybody   is/are/am   here for you.  All of them   is/are/am  waiting to listen to your speech. 9.  Ten dollars   is/are/am   a nice raise.  I need the extra money. 10.  Rice   is/are/am   a common food all over the world.  It   is/are/am   very cheap.  Two bags of rice   cost/costs  only £7.  11.  Either the bus driver or the motorcycle rider is/are/am responsible for the accident. 12.  Neither the 23 children in the class nor Tony seem/seems to be upset about failing the spelling bee. 13.  A large number of countries is/are/am members of the United Nations. 14.  Not only the fans but also the team's head coach was/were shocked to be in the championship game. 15.  The number of computer advances is/are/am increasing every year.