brackets. 1I'm afraid the problem is much... (complicated) 2. This bag is slightly...(heavy) than the other one. 3. Yesterday was..(hot) day of the year 4. The ...(soon) we…

Here are the completed sentences with the correct forms of the adjectives and adverbs in brackets:

1. I'm afraid the problem is much more complicated.
2. This bag is slightly heavier than the other one.
3. Yesterday was the hottest day of the year.
4. The sooner we leave, the sooner we will arrive.
5. I spent less money than you.
6. Who is the best student in the class?
7. What is the most popular sport in your country?
8. Could you speak a bit more slowly?
9. The longer she waited, the more impatient she became.
10. What was the most enjoyable holiday you've ever had?

For the second set of sentences:

1. What is the longest river in your country?

2. Don't go by train. It's a lot more expensive.

3. Your English is improving. It's getting better and better.

4. The younger you are, the easier it is to learn.

5. He is as young as my brother.

6. The garden looks better since you tidied it up.

7. You must be serious at your work.

8. Last year was by far the best the company has ever had.

9. She is the least clever person in our class.

10. This bag is slightly heavier than the other one. (This sentence was repeated, so I am including it here as well).