10. It's easy to use different types of public ___ in big cities. (transport)

Transportation.

Explanation:

It's easy to use different types of public transportation in big cities.

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the answer would be: it explains that at least one son must join the church

the expression ''as the tithe of his sons'' indicates how his father intended for at least one of his sons to serve the church. this phrase demonstrates that his father offered him as a last resort since none of his brothers chose to serve the church.

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