18/ Fill in the missing letters. (Вставь пропущенные буквы). sell 0 l or ll? 7 ch or sh? 1 s or ss? discu bea 8 k or ck? erent thi 2 for ff? di 9 c or s? →i -> mi Lland 3 l or ll? ion 10 c or s? Pa ific 4 mm or m? → progra 11 ch or sh? → fi 5 mm or m? → swi. ing 12 s or ss? cla ical 6 rr or r? → te ific 13 s or ss? →le. on Help me!