She is temporarily off work to take maternity leave.

Traffic cones have been set up due to road construction.

In chemistry class, I learned about basic oxides.

In chemistry class, I learned about the reactions of acid anhydrides.

Acidic oxides react with water to produce acids.

Basic oxides react with acids to produce salt and water.

Essential amino acids cannot be produced in the body, so they need to be obtained from the diet.

My father is thirty-nine years old.

São Tomé and Príncipe is an island country in Africa.

The monk was meditating in the garden.