单项选择题______ there's a good reason for her absence, as she doesn't usually stay away from work.
单项选择题He spends about 10 days each month back in Hong Kong, ______ projects in the works at his production company.
单项选择题It is sometimes difficult to discuss medical issues in a way that is not ______ to ordinary people.
单项选择题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.