Fill in the blanks with the appropriate form of the word given in the brackets.

Chances of developing brain tumours …………………….. (be ) high for those who ……………………. (hook) to their mobile phones. A study by Swedish scientists ………………………… (indicate) that an hour a day on a cell phone for a decade is enough to increase the risk. The researchers …………………….. (call) for special caution regarding children. Cell phone usage ………………………. (suspect) for some time for the health hazards it …………………….. (pose). While some studies ………………………. (show) that people who use cell phones for long periods …………………………… (face) the risk of malignant tumours others said it could lead to hearing impairment and sleep disorders.

Answers

Chances of developing brain tumours are (the subject is the plural noun chances) high for those who are hooked (a passive verb is required here; the subject is the plural pronoun those) to their mobile phones. A study by Swedish scientists indicates (the subject is the singular noun study) that an hour a day on a cell phone for a decade is enough to increase the risk. The researchers called for special caution regarding children. Cell phone usage has been suspected (the present perfect is common with since and for) for some time for the health hazards it poses. While some studies have shown that people who use cell phones for long periods face the risk of malignant tumours others said it could lead to hearing impairment and sleep disorders.