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Попытка намбер ту: -)

1) Global warmIng has BEEN predicted for a long time now.
2) People should BE encourageD to recyCle their waste(S).
3) A new species of birdS was -- discovered (HAS BEEN DISCOVERED) by scientists. (http://www.multitran.ru/c/m.exe?l1=2&l2=1&s=species)

4) I'm really looking forward TO BEING taken to the zoo tomorrow. (http://www.multitran.ru/c/m.exe?l1=1&l2=2&s=LOOK+FORWARD+TO)

5) The elephants in this area should BE protectED by a ban on hunting.

PS Ссылки даны для спорных вопросов!

Global warming has been predicted for a long time now
People should be encouraged to recycle their waste
New species of bird were discovered by scientists
I'm really looking forward TO being taken to the zoo tomorrow потомучто TO LOOK FORWARD TO SOMETHING
The elephants in this area should be protected by a ban on hunting

ДУБЛЬ ДВА)

1) Global warmIng has BEEN predicted for a long time now.
2) People should BE encourageD to recyle their waste.
3) THE NEW SPECIES OF BIRDS WERE DISCOVERED BY SCIENTISTS
4) I'm really looking forward BEING taken to the zoo tomorrow.
5) The elephants in this area should BE protectED by a ban on hunting.

1. Global warming has been predicted for a long time now
2. People should be encouraged to recycle their waste
3. A new species of bird was discovered by scientists
4. I'm really looking forward to go to the zoo tomorrow
5. The elephants in this area should be protected by a ban on hunting

been
be encouraged
The new speicies и were discovered
OK
by an interdiction on hunting