用方框里的介词或副词填空

【小题1】The man questioned by the police insisted that he had nothing to do ________ the crime.
【小题2】He has made it a rule not to put ________ what can be done today till tomorrow.
【小题3】So confusing was his speech that the audience couldn’t make ________ what he was trying to express .
【小题4】Mr. Green feels that he is old, so his son will soon take ________ his business.
【小题5】The population growth of the country mainly results ________ the high birth rate.