Complete the sentences with the correct comparative or superlative form of the words given. 1. Trekking through the mountain is than going on a picnic! (dangerous)

2. The smog in Beijing was I had ever seen.(bad)

3. Air fares are becoming less and . (expensive)

4. Beach holidays aren't as backpacking.(exciting)

5. Titanic was passanger ship of all. (famous)

6. The sea warms up in the winter than in the summer.

7. For me, no city isVenice.(impressive)

8. You can book online now than when you didn't own a computer. (easy)

1.more dangerous

2 .the worst

3. more expensive

4.more exciting

5.the most famous

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.