The answers are:
1. The country that borders Uruguay is Brazil.
2. Uruguay has suffered a series of floods
3. The reason the residents of Montevideo might be glad about the reopening of el observatorio meteorológico del colegio pio is (D) because it provides early warnings about dangerous storms that are approaching.
4. In the event of un incendio you should call first/ (A)los bomberos
5. Atilio Pelossi is best remembered for being valiente (brave). He died when he was saving a human life.
6. Two natural disasters are: el terremoto y la tormenta (C)
7. He read the newspaper (past tense) El leyó el periódico
8. Yo trabajaba en la empresa is best translated as: D) i used to work for that company.
9. Cuando ellos llegaron, Maria hablaba por teléfono