148.The illness from which Mary is suffering has now beenas hepatitis （肝炎）.

52.If only Imy four years of college life!

51.If theybefore we leave tomorrow, we should invite all our friends to hold a party to welcomethem.

50.Thank you for your hard work. I don, t think wethe thing without you.

49.But for the favorable weather, wea picnic beside the river.

48.If Ibetter at science, I＇d be a doctor now.

47.If they hadn＇ t spent all the money on the stocks, their lifeso miserable at the moment.

46.Had she worked harder, shethe exams.

45.My mother suggests that wefor a change this weekend.

44.He talks so much about America as if hethere before, but he has never been abroad.

43.Without water and sunshine, plants on the earthat all.