Listen and speak in English 1.- How many times does number " 9 " appear between 1 and 100? Think about it. You cannot use a pencil and paper. 2.- Look at these letters: O T T F F S S ? , can you discover which is the next one? Why? 3.- You've got six buckets. Three of them are full of water and the next three are empty. How can you make that the full and empty buckets alternate by moving just one of the buckets? 4.- Is there anything else worse than finding a worm while eating an apple? Why? 5.- Two American Indians, a child and an adult, are sitting on a big log. The little Indian is the adult's son, but the adult is not the little Indian's father. How is that possible? 6.- It takes a snail ninety minutes to go from A to B, but it takes it one hour and a half to return from B to A. What is the difference due to? 7.- A plane is flying from Madrid to Paris. Just over the Pyrénées it falls down and crashes on the border between Spain and France. Where would you bury...