Another way to judge whether your home has or could develop indoor air problems is to potential sources of indoor air pollution.

单项选择题Since her husband lost his job, the hopes of their buying a house have ______ even further.

单项选择题To people's astonishment, the effort to bring the quarreling couple together again ______.

单项选择题The grounds of the presidential palace are ______ by soldiers with guard dogs 24 hours a day.

单项选择题A ______ of the long report by the budget committee was submitted to the mayor for approval.

单项选择题Last month disagreements about who should be ______ to vote brought registration to a halt.