根据所给中文完成句子
54. 他给我们提供了一条多么有价值的建议啊!
What to us!
55. 我想知道他离开澳大利亚多久了。
I wonder Australia.
56. 除非在医疗上投入足够的钱，否则这些病人难以被治愈。
These patients .
57. 他把一生都投入到保护环境上去了。
He .
58. 越来越多的公司正在重视提高他们的产品质量。
the quality of their products.
59.到2011年底为止，你父母已经去过好几个国家了吗?
2011?
54. What a valuable suggestion he (has) offered to us!
55. I wonder how long he has been away from Australia.
56. These patients can’t be cured unless enough money is spent on medical treatment.
57. He (has) devoted all his lifetime to protecting the environment.
58. More and more companies are paying attention to improving the quality of their parents.
59. Had your parents been to several/quite a few countries by the end of 2011?