100 ! fill in the gaps with the missing words in the following sentences,the first letter of each word has been given to help you: 1)science with a variety of subjects. 2)scientists for the answers to the different questions. 3) the structure of the cells is by the scientific fields are not clear. 6)the natural,social and technical sciences are closely 7) the ages, people have invented tools,machines, and materials to make work easier. 8)science much to modern technology. 9) some modern technologies on science. 10) during our time we watch tv. 2.a)find in the texts the words which have the similar meanings as the following words . wide,to research,to attempt,to believe,to examine,main,complex,difficult,to start,big,a motor,various,to study. b)find in the texts the words ,which have the opposite meanings as the following words . narrow,easy,practice,artificial,old,more,to begin,small,little.