CREATE TABLE "chart_singles" (
  "year" real,
  "us_billboard" real,
  "us_cash_box" text,
  "us_ac" text,
  "can_ac" text,
  "title" text
);

Question: What is the US cash box before 1978 with a US billboard of 35?
SQL: SELECT "us_cash_box" FROM "chart_singles" WHERE "year"<1978 AND "us_billboard"=35;