Instruction
Select the best answer to complete the sentence.
1. This vending machine is -------- of service.
2. This contract is -------- to approval by all the board members.
3. -------- regard to the new company policy, please refer to the file attached to this email.
4. Any visitors to our company must sign in at -------- the guard office or the entrance of the building.
5. There must be something -------- with the air conditioner.
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