Americans have something _______ Thanksgiving, a festival which celebrates the first harvest of the settlers who _____ from Europe to the USA. A. calling ; goes B. calls ; going C. which called; gone D. called ; went
The dead rate is _____ pigs and recovery usually ______ within 7-10 days.
A low in; occurs B. rich in;happens
C. high in; came about D. poor in;took place