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Indicate the correct verb form (in italics) in each pair (a) or (b): If the economy does not improve, lots of businesses (a) will close / (b) would close.
This burglar alarm is so sensitive it goes off if a mouse (a) runs / (b) will run across the floor.
We might sell our business if it (a) makes / (b) would make another loss this year.
The company (a) was / (b) would be more successful if it spent more money on advertising.
The correct alternatives are: