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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