Four years ago, Jane was twice as old as Sam. Four years on from now, Sam will be 3/4 of Jane's age. How old is Jane now?
For the last fifty years, the globe has been warming (1)____.
It is true that the average temperature (2) r____is only about two degrees, but that has been enough to start the glaciers (3)____(recede) in many parts of the world.
A rise of one degree per generation is a large increase. Nature seldom moves as swiftly as this. We may have been helping her. To a very large (4)____, the temperature of the Earth is determined by the amount of solar heat which the atmosphere can (5) ke____ . The air above us sets like the glass in a greenhouse, trapping many of the heat waves which would (6)____bounce back into space. Carbon dioxide in the air is mostly responsible (7)____the “greenhouse effect”; it is a gas produced by all our countless fires, furnaces and internal combustion engines.
The end of the short-lived age of fossil fuels is already in (8) si____ ; soon in one or two centuries at the most we will have wasted all the world’s resource of oil and coal. This no longer means disaster, for (9)____(atom) energy has arrived in time to save our civilization from dying through lack of power. We are moving into a brighter and cleaner age, as the smoke of millions of fire and furnaces and automobiles ceases to (10)____(dark) the sky. But for that very reason, it may also be a colder age.
Research Is a State of Mind For many years there has been much misunderstanding as to just what research is. The popular conception seems to be that there is something mysterious about it, and before any research can be done it is necessary to have expensive scientific apparatus and large, elaborately equipped laboratories. Actually, this is not so. (6) It is a simple, organized way of trying to accomplish something you wish to do—so simple that anyone can do research anywhere at any time. First, you select the problem you would like to solve, then you list at least ten reasons why it has not been solved. (7) It takes just as much effort to solve a useless problem as a useful one. (8) After carefully—and I want to emphasize that word “carefully”—selecting the problem and the ten things between you and the solution, you then use the same procedure as in solving a crossword puzzle.(9)In the solution of the remaining obstacles you may need some simple apparatus, but the things you will probably need most are infinite patience and persistence. Few people realize the difficulties of doing any new thing. Maybe one of the reasons people are so easily discouraged is because of their education. During all our years at school we were examined two or three times a year. If we failed once, we were out. (10)If we are going to make progress, we must learn to fail intelligently so that we won't become discouraged at the 99.9 per cent failure. 6.()
A man is 36 years old. He asks the other man how old he is. The other man answers: “I am twice as old as you were when I was as old as you are today.” How old is the other man?
_____
The company has()some major changes in the last five years.
A man is 48 years old. He asks the other man how old he is. The other man answers: “I am twice as old as you were when I was as old as you are today.” How old is the other man?
It took millions of years for order to grow out of the()of the universe.
By next year he()in New York for five years.
He has smoked for so many years that he can()give it up