This means that after a while your body becomes     1     to having nicotine in it. So when the drug leaves your body, you get withdrawal symptoms. I remember feeling bad-tempered and sometimes even in pain. Secondly, you become     2     through habit. As you know, if you do the same thing over and over again, you begin to do it     3    .

There is no doubt that the earth is becoming warmer and that it is human activity     4     has caused this global warming rather than a random but natural     5    . All scientists     6     to the view that the increase in the earth’s temperature is due to the burning of fossil fuels like coal, natural gas and oil to produce energy.

Having experience quite a few earthquakes in Hawaii already, I didn’t take much notice. I was about to go back to sleep     7     suddenly my bedroom became as bright as day. I ran out of the house into back garden where I could see Mount Kilauea in the     8    . There had been an     9     from the side of the mountain and red hot lava was     10     hundreds of meters.