根据首字母填上所缺单词Dogs have been man's good friend for t( ) of years.Many stories told how brave dogs hel;ed people in t( ).The first spacetraveller was a dog n( ) Laika.It was setup in a manmade earth satellite in 1957 by R( ) scientists.

Dogs have been man's good friends for these years.Many story told how brave dogs helped people in terrible.
The first spacetraveller is a dog named Laika.It was set up in a manmade earth satellite in 1957 by R? scientists.
对不起,最后一个不太知道.

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Dogs have been man's good friend for t(housands ) of years.Many stories told how brave dogs helped people in t(rouble ).The first spacetraveller was a dog n(amed ) Laika.It was set up in a manmade ear...