два предложения в zero conditional

1) If you fly with budget airline, you have to pay for your snacks and drinks. 2)When unemployment is rising, people always tend to stay in their present jobs.

If you heat water to 1000 Celsius, it boils. -
Если нагревать воду до 100 градусов  Цельсия, она кипит.

If you drop a book, it falls.
Если вы уроните книгу, он упадет.