lose one's keys/job/weight/head
I lost my keys/job.
My pen is missing.
I can't find...
I can't find my pen.
A: Hello, John. You look very upset. What's the matter with you?
B: There is something wrong with my computer. I lost the powerpoint presentation that we have been preparing for one month.
A: You lost everything! No! It is very important. We need it for tomorrow morning. Do you have it on your USB drive?
B: My USB drive is missing. Could you give me some advice?
A: You're so careless. But don't you save it on the computer?
B: No. it took up too much space, so I Deleted it. But I forgot to check the recycling bin. It might still be there. Wait a moment. Let me check.
A: Is it there?
B: No. I don't know what to do. I shouldn't have deleted it. Is there anything else you can do?
A: The only way is to find your USB drive. How about flipping through your trash can to see if you accidentally throw it away?
B: I wouldn't do such a stupid thing.
A: You can go to the lost and found office in the company. Perhaps someone picked up your USB drive.
B: Good idea. Thank you very much.