Choose the most appropriate answer.

If I ____ her telephone number then, I would have called her.
1. Knew
2. had known
3. would know
4. would have known
Why didn't you ask Tom for help? If you had asked him, he ____ you.
1. will help
2. will have helped
3. would help
4. would have helped
If he ____ harder for his final exams, he would have passed them.
1. studied
2. had studied
3. would study
4. would have
If he ____ us, we wouldn't have finished our work so quickly.
1. hasn't helped
2. didn't help
3. hadn't helped
4. wouldn't help
If I ____ enough money, I could have stayed at a five-star hotel during my vacation last summer.
1. had
2. had had
3. would have
4. would have had
We were terribly late. If we had taken a taxi instead of a bus, we ____ on time.
1. may arrive
2. might arrive
3. might have
4. arrived
They ____ for a picnic yesterday if the weather had been warmer.
1. would go
2. would have gone
3. went
4. had gone
He wouldn't have had an accident if he ____ more careful on that day.
1. had been
2. has been
3. was
4. were
If he hadn't been so busy at work last week, he ____ more time with his children.
1. may spend
2. might spend
3. could spend
4. could have spent
____ I known his true intentions, I would not have allowed him to stay in my house.
1. Have
2. Had
3. Should
4. Were