1. 选词填空

hear from,   German,   possible,   strange,   hero

1. （1） When you are alone in another city, remember never to talk to any .
3. （2） He left our school two years ago. I haven't him since then.
5. （3） Doctors and nurses are real . They fight the COVID-19 without thinking of their safety.
7. （4） Nothing is if we put our hearts into what we are doing.
9. （5） In my class, two students come from and three come from the US.