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Man has invented four kinds of satellites.
The first of satellite student the ____1____ of the earth . They are used to make maps. They also help countries to see where they may ____2____ oil or gold.
The second kind of satellite is used to guide ships and planes. A ship or a plane can ____3____ a message to the satellite，and the satellite can find out ____4____ the ship or the plane is.
The third kind studies the weather. These satellites ____5____ clouds and strong winds moving across the earth . They warn countries to make preparations when very ____6____ weather is coming.
____7____ kind is used for communication. Telephone calls ____8____countries can be sent by these satellites. Some can carry hundreds of calls at the same time. The call is sent to the satellite，then the ____9____ sends it to a station in the country and this country is being phoned. These satellites also carry pictures；they can receive and send eight ____10____ at a time.
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