英语：同义句转换

英语：同义句转换

We haven't met for a long time

___ ___ ___ ___since we met last time.

If we beat them in the match,we will be the best.
if we ___ ___ ___,we will be the___.

You should return the book to the library on time.
You should___the book___ ___ the library on time.