1,riding without a helmet is dangerous It is .................. 2,drinking enough water is beneficial for our general health it is.......... 3,my friends are so thoughtful to bring me a lot of present from their abroad trip it is ........... 4,playing violent games is harmful for children 's mind it is,........... 5,you were careless to lose their wedding invitation it was........... 6,the old lady was fortunate to get out of the accident without any injuries it was............. 7,i think the boy was very obedient because he listened to everything his mother told him (using to - infinitive) it was............... 8,everybody believed he was so generous after he gave a motorbike to each member of the whole crew (using to - infinitive) it was............. 9,his lying to everyone surprised me so much i......................that.............. 10,he passing that difficult test made her parent very happy and proud her parent ..........................that,.......................