单项选择题
（）conduct a background check on the company, making as many phone calls and Internet searches as you can.
A.Though B.Throughly C.Thorugh D.Thoroughly
单项选择题 Use the（）version of your web browser.
单项选择题 （） people who report such crimes, （）criminals are arrested.
单项选择题 If（）, visit a local law enforcement office and ask their opinion.
