. Sometime I’d like ............... to play the piano. A. to learn B. learn C. learning D. to have learned 7. Please remember ............. this letter. A. to post B. post C. posting D. to have posted 8. We tried ...................... the fire out but we were unsuccessful. We had to call the fire-brigade. A. putting B. put C. to put D. to have put 14. It’s very kind of you .................. so. A. say B. to say C. saying D. to be saying 15. Please show me how ............. this. A. do B. to do C. doing D. to have done 16. One is never too old ............... A. learning B. learn C. to have learned D. to learn 17. You are old enough ............. out alone. A. going B. go C. to go D. to have gone 18. I’m very glad ................. you. A. to meet B. meet C. meeting D. to be meeting 19. It’s nice ............. you. A. to know B. know C. knowing D. to be knowing 24. We came ............. her. A. help B. to help C. to have helped D. helping 25. I’ll invite her ............. my daughter. A. teaching B. teach C. to teach D. to have taught 27. It’s no good ............. video games. A. play B. to have played C. to play D. playing