1. If you have any questions about the project, please feel free to -------- us.

2. Mr.Beck had to make a phone call to the Star Hotel to request the -------- of his room reservation.

3. Mary spends all her time either playing games -------- watching YouTube videos on the weekend.

4. Any visitors to our company must sign in at -------- the guard office or the entrance of the building.

5. While you are on a business trip to Ukraine, you are expected to take -------- to ensure your own safety.