Practice 2 : ......There , he had to 4 at some 50 different stores or restaurants before finding food . The 5 is all the more serious when you consider the 6 exercise required to bike from France to Poland . 4.A . work B . shout C . ask D . jump 5.A . competition B . conversation C . conflict D . challenge 6.A . adequate B . rewarding C . demanding D . suitable