---Why didn’t you go shopping with me two hours ago?---Because my mother________ me outside.
Water is the cheapest drink. And it is also ______.
The teacher is already standing here. Do you know when she ______?
I’m busy now. I ______ to you after school this afternoon.
Eric arrived on time, ______ it was the rush hour.
Someone ______ at the door. Can you open it?