The job position in the advertisement requires that the applicant ______ at least 8 years of working experience.
According to the school rules, no student __________ go out of the school after eleven o’clock at night without the teacher’s permission.
Going on a trip into space must be quite exciting experience.
Food supplies in the flood-stricken area _______. We must act immediately before there’s none left.
He _______ have taken your car by mistake because he didn’t have the keys.
It is not always easy for the public to see _______ use a new invention can be of to human life.