There _____a number of books in our school library. The number of books_______getting larger than last year.
Sam likes trekking_______the jungle, because he thinks it's exciting.
_______15th International Film Festival will be held in Shanghai.
—I'm doing a survey. Could you tell me ______? —Sure. I usually go to work at 7:00 am.
—How often do the students play sports?
Kevin will give less homework to his students if he ______ a teacher.