—What’s fifteen and thirteen ? —It’s .
— What would you like to drink?— It doesn’t matter. ______ will do.
They learned it all by themselves. That is to say nobody told them ________ .
--- Are there ___________ students in your school? --- Yes, _____________ the students is about 2000.
___________ it snows, ____________ the children feel.
Luo Yang devoted all his life _________for China Nation Aviation(中国航天).