Fill in: reserve, farming, energy, stations,
evaporate, balanced.
1 Endangered species will be protected in the
wildlife
2 A(n) ecosystem is necessary
for all wildlife to survive.
3 When watering your garden bear in mind
that water will more quickly at
midday.
4 Organic
has become more
popular since concerns arose about GM
crops.
5 A team of physicists are responsible for
checking the safety of our nuclear power
6 More houses are powered by renewable
forms of
... these days.

reserve, balanced, evaporate, farming, stations, energy

Explanation:

being untruthful

eating too much

overstaying one's welcom

this is that correct answer.

21 balloons is the story of professor william sherman's travels.

in 1883, he set off from san francisco for a balloon ride over the pacific and was found a month later floating with 21 balloons in the atlantic ocean. this seemed an astounding feat and everyone wanted to know what had happened.    

professor sherman was loyal, however, and said he would tell his tale first to the western american explorers club in san francisco, of which he was a member. this built up suspense for several chapters before he began to tell of the wonders of his adventures and the amazing island of krakatoa, an island which had just been blown up by a volcano.  

the residents of krakatoa are all millionaires who live under a "gourmet government" of their own devising. we get to see all the incredible adventures that creative people with unlimited resources would create according to the author.