21£®Last week I bought several reference books for my English study, including      handbook of grammar and       second-hand book on how to memorize vocabulary.

       A£®the; the               B£®a; a                    C£®a; the                  D£®the; a

22£®Too much         to X-rays can cause skin burns, cancer or other damage to the body.

       A£®connection          B£®approach             C£®contact                D£®exposure

23£®Those young men were         by the police with causing a disturbance in the neighborhood.

       A£®charged               B£®blamed                C£®scolded               D£®accused