Решение #
a) decided (решил), tried (пытался), answered (ответил), watched (смотрел), stayed (оставался), kissed (целовал), visited (посещал), enjoyed (наслаждался), played (играл), cleaned (чистил), asked (спрашивал), wanted (хотел);
b) had (имел), ran (бежал), ate (ел), was/were (был), read (читал), saw (видел), went (шел), met (встретил), did (делал), took (брал), drank (пил), began (начал), gave (давал).