If you () water to 100°C, it boils.

• heats
• heat
• will heat
• heated

You won’t succeed ___ you put in more effort.

• if
• unless
• provided
• as long as

If I ___ more free time, I would learn to play the piano.

• have
• had
• will have
• would have

I’ll lend you my book ___ you return it next week.

• unless
• in case
• as soon as

• provided that

If she ___ harder, she would have passed the exam.

• studies
• studied
• will study
• had studied

The picnic will go ahead ___ it doesn’t rain.

• unless
• in case
• as long as
• provided that

If you ___ me, what would you do?

• were
• are
• had been
• would be

They would have missed their train if they ___ on time.

• wouldn’t leave
• don’t leave
• didn’t leave
• hadn’t left

If you ___ this button, the machine stops.

• pressed
• press
• will press
• had pressed

We’ll take a map ___ we get lost.

• unless
• in case
• if
• provided