21. in face of _______ failure , it is the most important to keep up__________good state of mood .
a. /; a b. a; / c. the; / d. /; the
22. most animals have little connection with animals of a different kind , _______ they hunt them for food .
a. if b while c. unless d. as
23.＿＿＿＿ sunday, the students are at home.
a. being b. to be c. it is d. it being
24. in front of the farmhouse ______.
a．lay a poor man b．laid a poor man
c．a poor man lay d．did a poor man lie
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