EXERCISES FROM PAGE 165

1. 

a) It sounds as if they are having a good time.

b) This isn't the way you are supposed to be doing this

c) He looked as if he was carrying something.

d) I took up jogging as you suggested.

e) He behaved as though he owned the place.

f) The meat tasted as if it hadn't been cooked properly.

g) Peter didn't conduct the experiment the way he was instructed to.

2. Will human beings ever live on other planets?

Although we have become accustomed to the idea of space travel, and in films and fiction it seems as though space travel is inevitable, it appears unlikely that human beings will ever get any further than Mars, our nearest neighbour. No matter how many films we make about space travel, the fact is that it remains technologically challenging and extremely expensive. Since the distances involved are immense, any voyage outside our solar system would take hundreds of years using current technology. Wherever human beings went into space, they would have problems of how to eat and breathe, and their spaceship would have to carry vast amounts of fuel in order to cover the distance. Even Mars is so far away that it would take about six months to get there. As the distance between Earth and Mars varies, astronauts would have to wait for nearly two years before they could return using the shortest journey time. Even though it could cost as much as $100 billion, a manned mission to Mars is planned for sometime between 2010 and 2020.