Упражнение 1. Вставьте глагол в нужной форме, чтобы образовать условные предложения 0-го типа. If you __________ (to drive) along the river bank it _______ (to be) twenty miles out of your way. If you _____ (to take) your mobile phone into class, it __________ (must) be turned off. We ________ (not use) calculators when we ________ (write) tests. If you ________ (to push) this button, the volume __________ (to increase). If you __________ (to close) the door, it _________ (to lock) automatically. I_________ (to wear) my old boots when I ___________ (to work). When I ___________ (to cook) salads, I _________ (to use) only olive oil. When I ___________ (to concentrate), please ____________ (not to make) so much noise. Unless prices ________ (to rise), it_________ (not to be) a good investment. Unless someone_________ (to ask) you politely, ___________ (to refuse) to do anything.

Drive / is