19. We find that some birds _______ twice a year between hot and cold countries.

    A) transfer C) migrate

    B) commute  D) emigrate

20. As visiting scholars, they willingly _______ to the customs of the country they live in.

    A) submit   C) subject

    B) conform  D) commit

21. More than 85 percent of French Canada’s population speaks French as a mother tongue and _______ to the Roman Catholic faith.

    A) caters   C) ascribes

    B) adheres  D) subscribes

22. The professor found himself constantly _______ the question: “How could anyone do these things?”

    A) presiding    C) pondering

    B) poring   D) presuming