21. The manager is still on _______ vacation, so I will be in _______ charge of the meeting today.
A. /; the B. the; / C. /; / D. a; the
22. All the neighbors admire the family _______ the parents are treating their child like a friend.
A. why B. which C. that D. where
23. Soon children in the camp had many friends, _______ they shared food, stories and projects.
A. for which B. with whom C. of which D. to whom
