I didn’t have to work all weekend — I did it by _______. 

Antarctica holds 90% of the world’s ice, and most of its fresh water (70%) is in a frozen          .

We are short of money, so every coin ______ now.

Four years had passed, and I found Mary had＿＿＿＿＿．

The country’s 　　　is based on trade.