There are 40 students in our class. ______ of them, about 35, sleep 8 hours every night.
--What's up? --I can't stand the noise outside. It's nearly________ me mad.
He doesn't tell me when he_______ . I'll telephone you as soon as he______.
——Who is knocking at the door? ——It ______ Mr. Black, because he_______Washington.
In winter people usually keep flowers in their houses to ___them from the cold.
—— I feel tired and sleepy. ——Why not _______?