Across
- 4. one of the basic operations, to take away
- 5. the acronym for the Programme for International Student Assessment
- 6. one of the basic operations, to find the sum
- 7. the disease that started in 2019 and 2020
Down
- 1. to be isolated from others
- 2. the worldwide spreading of a disease
- 3. a country in Central Europe with the flag colors red and white
- 6. a procedure required to solve something