1. 2 (The Second world war broke in 1939).

2. 2 (Humans lose their baby teeth when they are young.)

1. 3 (The Union Jack is the national symbol of Great Britain.)

2. 2 (You are trying to make me feel that I need not to be grateful for you.)

1. 1 (I am grateful of you for encouraging words and kindness, for everything you have done.)

2. 3 (Johnsy was small and quiet, with big blue eyes and   light hair,  but she was stronger than fue.)

1. 2 (He also told me that he had a laboratory and   three assistants whom he had trained.)

2. 1 (He thought he would be able to make such substance with the help of a new element which he had found.)