3/Since the beginning of this century,too many natural resources have been used.
4/He is the only student who was late this morning.
5/As far as we know,Africa is world's second largest continent.
3/Since the beginning of this century,too many natural resources have been used.
4/He is the only student who was late this morning.
5/As far as we know,Africa is world's second largest continent.
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