My boyfriend gave me a gift.

Everyone was surprised by the news.

I bought a new notebook at the 100-yen shop.

The death rate of the new coronavirus varies greatly by country.

The efficiency of this machine is very high.

The birthrate in Japan is decreasing year by year.

Pi is approximately 3.14.

The economy is suffering because the unemployment rate is rising.

The voting rate for this election exceeded 70%.

Young's modulus is a physical quantity that represents the elasticity of a material.