1A
2B
3D
4A

1. They _____________ angry if you didn’t visit them.
A. would be B. should be C. would D. should
2. What would you do if you _____________ a million dollars?
A. win B. won C. had won D. will win
3. What will happen if the air _____________?
A. was polluted B. be polluted C. is polluted D. has polluted
4. He wouldn’t have had an accident if he _____________ more carefully.
A. drives B. drove C. had driven D. was driving
5. If you _____________ better last night, you wouldn’t have been so tired.
A. sleep B. had slept C. was sleeping D. slept

1 A. would be
2 D. has polluted
3C. is polluted
4 C. had driven

1 C
2 A
3 A
4 D
5 B
6 C