Public service ads,also PSAs,often _________ for free,_________ to educate people about health,safety or any other problem that affects public welfare.
When the students heard the alarm, they all hurried to they thought was an emergency exit door.
— Have you told Mary the good news that she was admitted into Shandong University? — Yes. I told her ________I saw her this morning.
—Your colleague's spoken English is quite good, Amy. — No wonder, as she in the USA for two years.
— We expected you yesterday. — I'm sorry, I you to say that I couldn't be here until today.
— Why did you give up the job in America? — Because I don’t want to stay far away from my girlfriend. You know, she means ______ to me.