One of our rules is that every studentwear school uniform while at school.
You are supposed ________ the work yesterday but you forgot.
He was educated at the local high school, ______ he went on to Beijing University.
The building required ________by the end of the year.
The teacher came in, ________ by some students.
He’s got himself into a dangerous situation ________ he is likely to lose control over the plane.A. where B. which C. while D why