As we know, too much ________ to Xrays can cause skin burns, cancer or other damage to the body.
She ____ have left school, for her bike is still here.
According to our school rules, no student ____ be permitted to carry mobile phones in class.
You have no idea what I have had to _____ during the last few months.
The woman told the workers that her house _____.
The school requested that all the students ____ school uniform on weekdays in school.