Check (') the sentence that uses the underlined parts correctly. 1_ A Vivian opens the office on arrival. B At close of business, Jason prepares for customers to arrive. 2_ A Virginia eats a lunch hour every day at noon. B Harry eats a small pastry during his mid-morning break. 3_A Employees must be in the office throughout working hours. _B Stella works over eight hours on half days.

Here are the correct options based on standard usage: 1. **B** At close of business, Jason prepares for customers to arrive. - The phrase "At close of business" correctly implies a specific time reference. 2. **B** Harry eats a small pastry during his mid-morning break. - The phrase "mid-morning break" correctly describes a common break taken in the middle of the morning. 3. **A** Employees must be in the office throughout working hours. - The phrase "throughout working hours" correctly indicates that employees are required to be present for the entire duration of the working hours. So, the correct answers are 1B, 2B, and 3A.