Listen again and write the missing word.

Playing games on mobile phone has also many disadvantages. Firstly, it can (1) …………. eye’s problems. Secondly , mobile phone can change their way to some unwanted things. Thirdly , using many functions on mobile phone can make students to be (2)…………. They don’t care about time for study and family. (3)………….,  radiation from mobile phones can lead brain damage and cause bad health (4)……………. For these reasons, parents should be considered before buying a mobile phone for your school children.

Firstly, it can (1) …………. eye’s problems.