Helen ____ go on the trip with us, but she isn’t quite sure yet.
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
Tom’s father, as well as his brothers, ________ in New York for a few more days.
The reason ________ he explained was________ he was ill and unable to go to school.