51. He was _________ before the eye operation. Now he can see things clearly.　

50. Three years ago my parents 　　　　　　(give somebody support, courage or help) me to study abroad, but for some reason, I gave up.　

49. His parents are so busy that they always leave him __________(by himself) on Sundays.

48. I’m wondering ___________(是否) to go to his birthday party or not. 　

47. _____________ (医疗的) machines were badly needed in those earthquake-hit areas.　

A．请根据题中空格后的中文提示、英文释义或句意，写出句中所缺单词，使句子通顺。

46. Most of the workers made a strong complaint ____________(反对) the company’s decision.