I found _________ hard to make myself understood by the old man.
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.
17. They don’t think advertisements are useful for our daily life, .