Finish the second sentence in such a way that is similar to the original one.
1. The world would be much better off if all environmental pollution stopped today.
-> Were . . . . . . .
2. He suddenly thought that he might have misunderstood her.
-> It crossed . . . . . . . . . . . .
3. You must concentrate on your study more.
-> You must apply. . . .
4. If you don't pay on time, your booking will be cancelled.
-> Failure. . . . . . . .