D. Complete the sentences using back, round, across or out. 16. She came ________ a letter from an old friend. 17. They came ________ to work when we called them.

16. She came **across** a letter from an old friend. 17. They came **back** to work when we called them. **Перевод:** 16. Она наткнулась на письмо от старого друга. 17. Они вернулись к работе, когда мы им позвонили.