Read the passage and fill in the blanks with proper words (在短文的空格内填入适当的词，使其内容通顺，每空格限填一词，首字母已给)
1．At one time, making a film was an expensive activity for only for a small group of people and film companies. Not only were the tools and machines expensive but also the cost of film was also far greater than most people could afford. However, modern technology has c____ all that.
2．New technology has really opened up the world of film making for film fans. Now a camera does not cost m____ and most young people are certainly able to pay for it. So all you need is to get one for yourself. With that, you may start your own film-making.
3．However, film-making is t____ work. You probably need many other people to help you.
4．For example, the p____ of actors and actresses is very important in your film. Of course, these actors and actresses may be your schoolmates, friends or family members. You don’t even need to pay them a cent while they are glad to be part of your job.
5．B____ , you need to make up a story. Can you write your own one? If you have good imagination, you can create an attractive story e____ . Many world-famous film maker and producers are also good story-writers. If not, perhaps you need someone else to write it for you. An excellent story is the key to making a s____ film.
2AB3。当反应达到平衡时，活塞位置如图2所示，则平衡时A的转化率是
