English grammar in use. Conditionals

Choose the right option to fill in the gap: If every person plant one tree, forests ..... (not disappear).

Choose the right option to fill in the gap: If people stopped using cars, there ..... (not be) so much pollution.

Choose the right option to fill in the gap: It is important to improve public transport and to encourage people to use it. If people commuted to work and to school by public transport, the result ..... (be) fewer cars in the city.

Choose the right option to fill in the gap: If people had bought products with biodegradable packaging the landfill sites ..... (not become) so full.

Choose the right option to fill in the gap: If people know that they wlll have to pay if they litter, they ..... (stop) doing it.

Choose the right option to fill in the gap: If animals in the zoos do not drink water, they ..... (die).

Choose the right option to fill in the gap: The Amur tiger ..... (not become) endangered species if the authorities had banned hunting.

Choose the right option to fill in the gap: People will think twice about using their cars if it ..... (cost) them money.

Choose the right option to fill in the gap: If it rains, the grass ..... (get) wet.

Choose the right option to fill in the gap: If you ..... (grab) a handful of healthy soil, you hold more organisms in your hands than there are people on earth.