（）social instruction on cargo securing.

单项选择题Go （）this ladder and walk aft.

A.down
B.to
C.up
D.in

单项选择题The first cabin astern of the saloon is（）.

A.he
B.him
C.his
D.they

单项选择题Secure danger area and （）, please.

A.reporting
B.report
C.reports
D.reported

单项选择题Danger area （）.

A.secured
B.secures
C.securing
D.securely

单项选择题Slack （）head line.

A.down
B.away
C.for
D.on