You read a book in the sun—it’ll do harm to your eyes.
Only then __________ how much damage had been caused.
—It’s burning hot today, isn’t it?—Yes. __________ yesterday.
So difficult __________ it to work out the problem that I decided to ask Tom for advice.
__________ homework did we have to do that we had no time to take a rest.
—Did Linda see the traffic accident?—No, no sooner __________ than it happened.