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1) The discovery of the existence of man apes of Southern Africa shows that these ancient and primitive beings lived there before and during rainy periods.

2) The British Goverment is trying to bring back life to the highlands.

3) For nine centuries the sea has protected the British from invasion and foreign occupation.

4) The scientists will have deciphered the inscriptions on this monument by the end of this year.

1 shows- Present Simple Activelived-Past Simple Active2 is trying- Present Progressive Active3 has protected- Present Perfect Active4 will have deciphered- Future Perfect Active