The Space Shuttle Columbia broke into pieces over Texas as it returned to the earth on February 1,2003,__________all seven astronauts aboard.
22. Victor apologized for________to inform me of the change in the plan. his being not able B. him not to be able C. his not being able D. him to be not able
21. He decided not to attend her birthday party________he had been invited to.
20. _______, English is one of the most important subjects.
19. At that time, people_____early in the morning in winter, and coal them warm.
18. When Tom woke up, he found himself_______in bed, with his bag beside him.