1. After you have used the materials，please put them back ________they belong.
A. where B. to which C. what D. that
2. They argued _____ the matter the whole afternoon, and at last agreed____ the date for the next meeting.
A. with; on B. on; over C. about ; on D. over; over
3. ______ with so much trouble，I am afraid, they will fail to complete the task on time.
A. Face B. Faced C. Facing D. To face
