The greenhouse manager has confirmed that closed vents trap heat around the seedlings. Select all that apply: which sentences correctly use unless or another first-conditional result form?

الشرح

The plain unless sentence correctly means if the vents do not open, matching the confirmed heat relationship, and the password sentence correctly pairs a present if-clause with an imperative. An ordinary open condition after unless takes the present form open, not would open, and will does not belong inside the if-clause.