Rockets that are now being (17)__________ are powerful enough to shoot a man beyond the earth’s gravity. In such a rocket a man could be sent into (18)__________ accurately enough to arrive at the moon . He could even get there gently and not be killed in a crash. (19)__________ supplies of air and food , he could live on the moon for weeks or even months. A trip to the moon is not just for adventure. It is practical and important (20)__________ it can give us valuable information about the weather. In space stations (21)__________ around the earth, men could live and study cloud information which could tell us what weather to expect in any part of the world at any time. Such information would be very (22)__________ to pilots, to ship captains and even to farmers who must set dates for planting and harvesting. We face another serious problem. If we don’t find a way to control the population, we will need new planets where people can live.
- A. made B. discovered C. created D. invented
- A. place B. space C. the earth D. the ocean
- A. but B. or C. with D. and
- A. although B. though C. however D. because
- A. revolve B. revolving C. revolved D. to revolve
- A. useful B. useless C. use D. in use
