8. We found it very difficult __________ with Gamma. A. to work B. work C. working D. worked 9. I can’t read when I am traveling. It makes me __________ sick. A. feel B. to feel C. felt D. feeling 10. I need __________ what’s in the letter. Why don’t you let me __________ it? A. to know/ to read B. know/ read C. to know/ read D. knowing/ read 11. I suggest __________ some more mathematical puzzles. A. do B. to do C. doing D. done 12. We regret __________ you that we cannot approve your suggestion. A. inform B. to inform C. informing D. informed 13. The driver stopped __________ a coffee because he felt sleepy. A. have B. to have C. having D. had 14. Have you ever considered __________ a pharmacist? A. become B. becoming C. to become D. became