____ has recently been done to provide more buses for the people, a shortage of public vehicles remains a serious problem.
You _______ have washed the dishes. I would’ve put them in the dishwasher.
After the summer camp, I realized I wanted to take a route ________ I could use English all the time.
Was it midnight ________ the fire broke out?
— ________ he ________ anything about this historic site? — Yes. That’s why he suddenly becomes so obsessed with it.
You should never base anything on a theory that _________ impractical in practice.