One of our rules is that every student_____wear theschool uniform while at school．

The driver wanted to park his car near the roadside but was asked by the police ________．

Studies show that people are more to suffer from back problems if they always sit before computer screens for long hours.

It was not until she got home _______ Jennifer realized she had lost her keys. [ ]

What is itmade Carl determined to give up smoking?——-Watching how his father died in pain from lung cancer.