单选题 - Thank you for inviting me.
- _______

单选题 Antarctica is called a desert because it has little moisture and no lakes or rivers.

单选题 - Hey, Tom, what's up?
- __________

单选题 - I'm sorry. I am late due to the heavy traffic.
- ________

单选题 The Antarctic has ten times as much moisture as the Sahara.

单选题 The snow in Antarctic is very deep because it piles up year after year.

单选题 The temperature in the Antarctic is always above zero.

单选题 - Excuse me, could you show me the way to the nearest post office?
- ______Oh yes! Two blocks away from here at the Green Avenue. You can't miss it.