Золотослитковый стандарт был впервые введен в _ и в _ годы Первой мировой войны Англии

- Good morning, doctor!

- Good morning!

- Dear doctor, I`ve got a toothache. What should I do?

- How many times a day do you brush your teeth?

- I brush my teeth three times a day.

- But what toothpaste do you use?

- I use a special whitening toothpaste.

- But you have to use a plain toothpaste.

- Oh, thank you. Goodbay.

- Goodbay.