Americans rarely shake hands to say goodbye, except ............. business occasions. 37. It was so interesting book that he couldnt put it ................ 38. We are grateful ................ our friends, who have done everything for us. 39. He had difficulty ............... making friends with other people. 40. The boys continued playing football without being aware ............. the rain.

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36. Americans rarely shake hands to say goodbye, except ......on....... business occasions.

37. It was so interesting book that he couldnt put it ......down..........

38. We are grateful .....to........... our friends, who have done everything for us.

39. He had difficulty .......in........ making friends with other people.

40. The boys continued playing football without being aware .......of...... the rain.