Question

She _____ providing a great public service if she _____ to get the business started. 1. could be / knows why 2. should be / knew why 3. would be / knew how 4. can be / know how

Answer 1

3. would be/knew how

The first blank must be future tense because the word after it ends in -ing

The second blank must be ____ how, and it must be past tense, so knew how. She knows <u />why the business would be started, to provide a great public service, but not how.