Решение:
Заполним пропуски подходящими частями идиом, чтобы предложения были грамматически верными и имели смысл.
- I tried to speak louder in order to make myself heard.
- You'll be at home at nine o'clock! Do I make myself clear, young lady?
- The meeting you're going to is extremely important. Don't forget to help yourself.
- Mr Richardson is a lonely soul and lives by himself.
Ответ: 1. myself heard; 2. myself clear; 3. help yourself; 4. by himself.