Hello, have you seen your mobile phone?

I happened to meet him at the street corner.

He was unfortunate enough to be involved in a traffic accident.

Since the results of the mock exam were not good, I have to study more.

I have a mock exam for math tomorrow.

Please give me that book.

Please do not press that button.

Please clean the room.

If you have an accident, please contact the police immediately.

Please connect with him about tomorrow's meeting.