23£®Play, often seen as        activity for kids, is still important in         development of teenagers.

       A£®the; the               B£®an; the                C£®an; ²»Ìî             D£®the; ²»Ìî

24£®      alone in the large house, the little boy had to learn to survive by himself.

       A£®To leave              B£®Leaving               C£®Left                    D£®Being left

25£®On snowy days, you have to drive very        to avoid traffic accidents.

       A£®cautiously           B£®neatly                 C£®smoothly             D£®properly

26£®The time is drawing near         food raised in space will directly benefit humans below.

       A£®where                 B£®when                  C£®whether               D£®why