_____people who learn Engiish as a foreign language ________more than 750 million.
Hurry up, ________ you will miss the train. It's leaving in ten minutes.
Not only his parents but also his brother ________ to the Summer Palace. They haven't been back.
You'd better do it ________ your mother did.
______ they are brothers, they don't look like each other at all.
--- When did you know the news?--- I knew nothing about it _________ my friend told me.