21. Though ______ water, he managed to survive for one week under the ruined house.
A. lacked B. lacking C. lacking of D. lacked in
22. The bell ______ the end of the period rang, ______ our heated discussion.
A. indicating; interrupted B. indicated; interrupting
C. indicating; interrupting D. indicated; interrupted
23. “Can you read?” Mary said ______ at the notice.
A. angrily pointed B. and point angrily
C. angrily pointing D. and angrily pointing
