Soluzione del esercizio 5 di Identity B1+

Esercizi svolti per il libro Identity B1+

Soluzione

  1. We should all reduce our consumption of fossil fuels.
  2. I've been watching a programme about conservation.
  3. Have you ever signed an online petition?
  4. Air pollution can be bad in warm weather.
  5. I've travelled by train three times this week.
  6. We've been celebrating Earth Day for 50 years.