D . diseases A. animals B. species C. bacteria 26. I __ many kinds of bread and on the whole I __ out that whole grain bread even tastes better than white bread. A. tried -found B. have tried -have found D. tried have found C. try -found 27. Since the 1970s the average cholesterol level of the American __ due to the growing consumption of red meat and sweeteners. A . increased C. has increased D increases B. is increasing 28 Before Covid -19,50% of Americans __ out once a week for convenience and for the enjoyment of it. A. eat B. ate C. had eaten D. has eaten 29. Since the pandemic __ ,many people __ less active and energetiC. A. began - have been B. begin -are C.has begun -were D. began -were ? 30.How many world records __ Usain Bolt,one of the fastest short distance runners alive, __ A. did-break B. is -breaking C. does -break D. has-broken 31. Some unhygienic conditions encourage the __ of disease. A . development B . increase C . decrease D. spread 32. Foot and mouth disease is caused by a highly __ virus which animals either eat or inhale. A. infect B . infection C . infectious D . infectiously 33. __ for both men and women has improved greatly in the past 20 years. A. Life work B. Life force C. Life expectancy D. Life skills 34.The poor boy had a serious chest __ which had spread into his lungs causing a very painful cough. A . sickness B . indisposition C . infection D . indigestion 35. A well- __ diet is the key to a happy and healthy life. A balanced B . informed C . preserved D . mannered 36. The patient is __ treatment.so there is nothing more we can do. A . resisting B .defying C . refusing D . opposing