The general ordered all the soldiers _________ alert (警惕的).
---Would you mind my using your dictionary? ---________
— It seems to rain soon. Take my umbrella. —. I have a raincoat in my bag.
This type of MP5 is my favorite, but I can’t it.
— Is that our math teacher? — It be him. He has gone to London.
— How clean the classroom is! — Yes, I am sure someone it.