For security purposes, always remember to check carefully the ________ of any caller who wants to get permission to your home.
举一反三
- At the security check, your hand luggage will not be screened.
- For security reasons, always log ______ when you leave your computer unattended for any period of time. A: on B: up C: in D: out
- To show your ticket and get your seat at the airport is to _________. A: check out B: check off C: check in D: check on
- He is a very ____________ sportsman who always wants to win.
- 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