At night, lock the outer gate.(change into passive)
AThe outer gate is requested to be locked at night.
BThe outer gate be locked at night.
CLet the outer gate be locked at night.
DThe outer gate is locked at night.
AThe outer gate is requested to be locked at night.
BThe outer gate be locked at night.
CLet the outer gate be locked at night.
DThe outer gate is locked at night.