Help the anxious museum curator finalize the security checklist for the new diamond exhibit by choosing the correct phrase for each blank.

The famous diamond must not be touched by anyone under any circumstances. To ensure maximum safety, all security cameras should be checked every hour before the doors open. Finally, the emergency alarms can be activated remotely if there's even the slightest hint of trouble.

The famous diamond must not be touched by anyone under any circumstances.

We form the passive voice with modal verbs using modal + be + past participle. Here, "must not be touched" shows that touching the diamond is strictly prohibited.

To ensure maximum safety, all security cameras should be checked every hour before the doors open.

"Should be checked" is the correct passive form to express a strong recommendation or requirement.

Finally, the emergency alarms can be activated remotely if there's even the slightest hint of trouble.

"Can be activated" shows that it is possible for the alarms to be triggered by someone remotely.