31 . Stop (talk) _______TALKING______ ; I am trying (finish)______TO FINISH_______a letter

32. His doctor advised him (give) _______TO GIVE______ up (jog)_______JOGGING______

33. My watch keeps (stop)_____STOPPING________

34. People used (make)_______TO MAKE______fire by (rub)_____RUBBING________two sticks together

35. He hates (answer)_____ANSWERING________the phone, and very often just lets it (ring)______RING_______

36. If you go on (let)____LETTING_________your dog (chase)________CHASE_____cars he will end by (be)______BEING_______run over

37. I prefer (drive) ______DRIVING_______ to (be)____BEING_________driven

38. I advise you (start)_______TO START______(look)___LOOKING__________ for a flat at once

39. Would you mind (lend)_______LENDING_____ me some money? I forgot (cash)____CASHING_________a cheque

40. (Lie)_______LYING______ on the beach is much more pleasant than (sit)__SITTING___________in the office

41. She like her children (go) _____GOING________ to the dentist every six months.

42. An instuctor is comming (show) ____SHOWING_________ us how (use) ________TO USE_____ the machine

43. I have no intention of (go)____GOING_________to that film ; I couldn't bear (see)SEEING my favorite actress in such dreadful part.

44. I suggest (telephone)____TELEPHONING_________the hospitals before (ask)_______ASKING______the police (look) _____TO LOOK________for him

45. After (hear)______HEARING_______the conditions I decided (not enter)_________NOT TO ENTER____ for the competition

46. Some people seem (have)____TO HAVE_________the passion for (write)________WRITING_____ to the newspapers

47. He expects me (answer)____TO ANSWER_________by return but I have no intention of (reply) ____REPLYING_________ at all

48. He postponed (make) ______MAKING_______ a decision until it was too late (do)_______TO DO______ anything.

49. Try (forget)______TO FORGET_______it ; It isn't worth (worry) ______WORRYING _______ about it

50. There is no point in (remain) ____REMAINING_________ in a dangerous place if you can't do anything(help)____TO HELP_________the people who have(stay)_____TO STAY________there