__ has been mentioned above, continued chairman after he took a sip of coffee, ____ the project must be carried out before spring flood comes.
He ___ without saying good-bye to them, for he always has good manners.
. He was not brave. He ____ jump down from the roof.
—Is your mother still a teacher? —______.
—Shall I go and buy two more bottles of beer? —No, I’ve already bought twenty. That ___ be enough for us two.
.—Did you visit the museum? —No, we ____ it, but we spent too much time shopping.