Culture et géographie du monde anglophone

Complete the following sentences about English-speaking countries using your knowledge:

1. The capital city of the United Kingdom is ______.
2. The United States of America is divided into $50$ states. The number of states can be expressed as a power of ten: $5 \times 10^1$.
3. The currency of the United Kingdom is the Pound Sterling, whereas the currency of the United States is the ______.