21．In most western countries, on April Fool’s Day, people often play _____ trick on each other; children especially have great ______ fun.
A．a; a B．the; the C．/; a D．a; /
22．The friends tried to settle the quarrel between Mr. and Mrs. Smith without hurting the feelings of ______, but failed.
A．none B．either C．all D．neither
