I did my homework very , so my father shouted at me .
Our teacher wants us ______ at school on Mondays.
Mary___________ computer science last year.
In ten years, John __________ an astronaut.
According to the latest reports on TV and in the newspaper, food safety is becoming a ____________ serious worldwide problem.
Drugs can do great harm (危害) not only to you but also to your family. You must be _________them.