Unit5 Virtual Reality
13. ____ i admit that there are still some problems about the surroundings here, i don’t mean that they can’t be solved.a. until b. while c. as d. unless14. she thought i was talking about her son, ____ in fact i was talking about my daughter. a. whom b. where c. which d. while15. although tigers are often trained, they cannot be easily tamed ____ caught very young. a. if b. unless c. when d. thoughkey:1. c 2. c 3. b 4. c 5. a 6. d 7. a 8. d 9. d 10. d11. b 12. c 13. b 14. d 15. b