All draughts must be ______ from the room.

A. What do you think has changed her so quickly
B. Who do you think the guest professor is
C. Where do you think is the cheapest hotel
D. How often do you think our mother goes to the cinema

A. Lightening can be dangerous.
B. Anyone can enroll for this course.
C. You could have known the truth.
D. May you succeed.