Heather is one of the biology student at the 76. ______ university. He is very busy and doesn’t have many free 77. ______ time these days. Heather attend several classes and lectures 78. ______ four days in a week; he has none on Tuesday. But he 79. ______ spends a few hours in lab every Wednesday. He 80. ______ has to do a few of experiments every day. Heather never 81. ______ has enough time to finish everything. There is too much 82. ______ pressure on him to complete all her course requirements. Still 83. ______ he doesn’t have any regrets about choosing biology for 84. ______ his future career. There is no other field that interests in him.85. ______