Réponse :
A.
1. Good teachers are able to explain complicated things clearly.
2. Scientists are more optimistic about the panda, they think they will be able to save it from extinction.
3. With more wind turbines we would be able to produce more clean energy, but we wouldn't be able to produce all our energy this way.
4. Scientists are able to create new medicines from substances in rainforest plants.
5. In the future doctors will be able to cure more diseases even if they aren't able to cure everything.
6. Today astronomers aren't able to see the whole universe, but scientists believe this will become possible in a few decades.
B.
1. Twenty years ago, people weren't able to text with phones. Today, people are able to text with portable phones . Tomorrow, people will be able to text and call with new technologies.
2. Before, only technicians and scientists were able to use computers . Today, even children are able to use computer.
3. Today people are able to print their documents at home with their printer. In the future, they will be able to print objects as well.
