单项选择题
The manager of the company firmly believed that one of the important （） sources of new customers was the children’s market.
A. unfolded B. unknown C. unsolved D. untapped
单项选择题 Whenever the government increases public services, （） because more workers are needed to carry out these services.
单项选择题 The Minister’s （） answer led to an outcry from the opposition.
单项选择题 She （） some salt on her food to make it taste better.
