填空题

Heather is one of the biology student at the 78.______
university. He is very busy and doesn’t have many free 79.______
time these days. Heather attend several classes and lectures 80.______
four days in a week; he has none on Tuesday. But he 81.______
spends a few hours in lab every Wednesday. He 82.______
has to do a few of experiments every day. Heather never 83.______
has enough time to finish everything. There is too much 84.______
pressure on him to complete all her course requirements. Still 85.______
he doesn’t have any regrets about choosing biology for 86.______
his future career. There is no other field that interests in him. 87.______