A．The local Africans are peace-loving people.
B．Soda bottles are very precious in some remote areas.
C．A trivial thing may sometimes bring about undesirable consequences.
D．Caution must be taken in introducing new technology.

A．Teach Don’’s class while he’’s absent.
B．Give Professor Webster the key to Don’’s office.
C．Leave a message on the board in Don’’s classroom.
D．Bring Don the homework that was due today.