13. A. able B. possible C. unable D. not possible
12. A. speaks B. is speaking C. spoke D. is spoken
11. A. some B. more C. other D. less
10. A. spend B. use C. take D. cost
9. A. If B. When C. Since D. Until
8. A. without B. with C. in D. by
7. A. them B. this C. that D. it
6. A. talk B. tell C. speak D. say
5. A. studied B. to study C. studying D. study
4. A. how much B. how long C. how fast D. how many