Present unreal conditional with unless, only if, and even if

Which of the following sentences is correct.

• I could wait more than 6 hours in the same place, only if there is food.

• Only if there is food, I could wait more than 6 hours in the same place

You will not be able to pass the exam …… .. Make an effort and study more.

• Unless

• Only if

• Even if

.............were lost, I would not have liked you.

• Even if.

• Unless

• In spite of

I could speak English very well ………. I would have been living in an English speaking country.

• Unless

• Even if

• Only if.

The only way I could travel in winters would be ……… my parents go with me.

• Unless

• Only if.

• If I were