subject verb agreement

subject verb agreement
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are
these cherries (is are) delicious
i (am, are) only one voice among billions
am
the girls' softall team (has, have) won all its games
have
freighters still (carries, carry) midwestern grain
carry
my cats (watches, watch) the birds for hours
watch
both athena and poseidon (has played, have played) important parts in these great eipcs
have played
neither george nor the twins (appreciates, appreciate) ancient literature
appreciate
either mr echevarria or ms olivero (is teaching, are teaching) a course in spanish.
is teaching
debra johnson or lillian and ton nash (is scheduled, are scheduled) to read aloud in class today
are scheduled
the football team (is having, are having,) their physicals
are having
our local teamsters' union (was deciding, were deciding) which of its two offers to accept
was deciding
physics (is , are) an intriquing subject
is
the hedge clippers (seems, seem) to work now
seem
family genetics (was, were) and important consideration in jerols therapy
was
many a town in the wild west (was abandoned, were abandoned) when gold or silver mines were depleted
was abondanded
several dollars per barrel (was, were ) often spent for clean water in the camps
was
on the frontier, fifty percent of the workers' food (was, were) made from flour
was
five dollars ( is , are ) the price of the book
is