a. if you leaves her.

　　b. unless she leaves you.

　　c. if she don't leave you.

　　2. If this storm gets worse,

　　a. we will have to go inland.

　　b. we have to get inland.

　　c. we must to go inland.

　　3. Watch out! If you touch that cable,

　　a. you will get a shock.

　　b. you shocked.

　　c. you had a shock.

　　4. I might have had time

　　a. if you needed my help.

　　b. if you had asked me for help.

　　c. if you ask me for help.

　　5. I'm afraid I can't understand you

　　a. if you speak unclear.

　　b. unless you speak more clearly.

　　c. if you don't speak clear.

　　6. She would have gone

　　a. if she had been in your position.

　　b. if she were in your position.

　　c. if she was in your position.

　　7. You would certainly have been angry

　　a. if you discovered what he knew.

　　b. if you had discovered what he knew.

　　c. if you had discovered what he had known.

　　8. We'll have to walk if we

　　a. run out of gas.

　　b. are going to run out of gas.

　　c. ran out of gas.

　　9. If someone offered to buy you one,

　　a. which one do you choose?

　　b. which one would you choose?

　　c. which one had you chosen?