I would have visited you before if there ___ quite a lot of people in your house.
A. hadn't been

If you had caught the bus, you ___ late for work.
C. wouldn't have been

If I ___ asked, I would express my feelings.
C. had been asked

If she ___ told her, she would have succeeded.
C. had been asked

If they were absent now, they would meet the head master.
D. wouldn't be (The correct phrasing is actually "they wouldn't meet the headmaster" as it should imply a different outcome.)

If he cleaned up the car now, his boss could ask him to do this.
D. could ask (The correct phrasing is actually "his boss could ask him to do this," but this sentence does not clearly fit; it might need context.)

Unless he refused everything, he would lose his family.
A. wouldn’t lose

If I saved my money, someone would take it.
D. wouldn’t take it (The correct phrasing is actually "someone would take it," which doesn’t fit here; it may need a rewrite.)

Unless you had stayed at home yesterday, you wouldn't have enjoyed a delicious meal.
B. would have enjoyed (This needs to be rewritten correctly to "If you hadn't stayed.")

Unless he had been busy last night, he could have met his friends.
A. would have met (This needs to be rewritten to "If he hadn’t been busy.")