Please remain ______ and report any unattended luggage to the authorities.

If the main engine of an unattended engine room shuts down automatically， it will be indicated by an alarm （）.

The number of unemployed people in that country is increasing rapidly. A: unaccompanied B: laid-off C: uneducated D: unattended

For security reasons, always log ______ when you leave your computer unattended for any period of time. A: on B: up C: in D: out

For security reasons, always log ______ when you leave your computer unattended for any period of time. A: on B: B. up C: C. in D: D. out

Which of the following behaviors is wrong? ( ) A: When the room is dim, accompanying reception personnel should enter the room first. B: When a man and a woman go upstairs or downstairs, they should follow the principle of “gentleman first”. C: When entering and getting off the unattended elevator, the accompanying personnel shall be first in and last out. D: When entering and getting off the attended elevator, the accompanying personnel shall be first in and first out.