Zero conditional

What is the correct form of zero conditional??

• Present simple + If ---> Present simple

• If + Present continues ---> Present continues

• If + Past perfect ---> Past perfect

• If + Present simple ---> Present simple

If the temperature drops below freezing, water ----------.

• Boils

• Freezes

• Freezing

• Boiled

Choose the right answer

If you _____ a cat, it______.

• Feeds / Purrs

• Feeds / Purr

• Feed / Purrs

• Feed / Purr

Choose the correct answer

If you _____ a book, you _____ knowledge.

• Read / Gain

• Reads / Gains

• Reads / Gain

• Read / Gains

Choose the right sentence, which of these sentences are correct for the zero conditional of "if"

• If it rains tomorrow, we will stay indoors and watch movies.

• If I won the lottery, I would travel around the world.

• She would have passed the exam if she had studied harder.

• If you ignite a fire, it burns.