Finish the sentences in such a way that it remains unchanged

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I. Finish the sentences in such a way that it remains unchanged.
31. Have you ever climbed a mountain before?
→ Is this
32. I started reading the book last night.
→ I have
35. This is the first time I have eaten out at a 5-star restaurant.
→ I haven't
36. I haven't met my best friend since she went to study abroad.
→ I last
37. It is two years since we last went on a picnic together.
→ We haven't
39. I last mopped the floor 3 days ago.
→ I haven't
61. They have never had such a cold winter.
→ It isthe
72. I've never read a more romatic story.
→ It's the
73. This is the best computer I have ever used
→ I have never
74. That's the worst film I've ever seen.
→ I've never
2. We only came by bus because there were no taxis.
→ If there
4. He smokes too much so he can't get rid of his cough.
→ Unless he
11. If you don't start at once, you'll be late.
→ Unless
14. Go to Britain and you'll be able to speak English all day long.
→ If
16. Write to her, or she will forget you.
→ If