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undergone experimented submitted sustained
They take a completely-free bus service. They experimented a very cheap bus service. Part of the street is for buses only. They closed the streets to cars.
is experimenting is experimented , is being experimented has been experimented
experimenting with experimenting on experimented with experimented on
branches of knowledge studied in a school something to be considered persons experimented on citizens in a country
experimenting with experimenting on experimented with experimented on
put out experimented out tried out taken out
undergone experimented submitted sustained
has been put into actual use was first put into actual use in 1977 had been repeatedly experimented on before 1977 was put on experiment in 1977
on; to by ; on with ; on with; to
London. Rome. Stockholm. None of the above.
experimented examined exercised tried
car pooling must be studied rapid mass-transit systems must be introduced flexible work hours, must be experimented overall strategies must be coordinated
has been put into actual use was first put into actual use in 1977 had been repeatedly experimented on before 1977 was put on experiment in 1977
has experienced .experienced experimented has experimented
London. Rome. Paris. Stockholm.
Calhoun' s experiment is still considered important today. Overpopulation causes pathological behavior in rat populations. Stress does not occur in rat communities unless there is overcrowding. Calhoun had experimented with rats before.
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