1．The number of people who ____ English as a foreign language ____ more than 750 million. A. learns; is B. learn; are C. learns; are D. learn; is 2．Hiking is ____ great fun. You will get close to ____ nature and take exercise at the same time. A. a; the B. a; 不填 C. 不填；the D. 不填；不填 3．The reason he could not go there was his grades were too low. A. why; because B. why; that C. for which; which D. for which; 不填 4．All the villagers the fight against the big flood, young and old, men and women. A. joined; including B. joined in; containing C. joined in; including D. joined; containing 5．When you finish, please put the book back it was. A. where B. at which C. the place D. the place that