You should take more exercise because that’s the way to get fit. If you ........, you ......... fit
take more exercise - will get
Road travel is cheaper than rail travel in this country. As a result we have lots of traffic jams.If road travel ..........than rail travel in this country, we ...... lots of traffic jams.
weren't/ wasn't cheaper - wouldn't have
Cutting down rainforests has caused many plants and animals to disappear. Many plants and animals..........if people ....... rainforests..
wouldn't have disappeared - hadn't cut down
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